Bezazepine derivatives as αv integrin receptor antagonists

ABSTRACT

The present invention relates to benzazepine derivatives and their use as αv integrin receptor antagonists. More particularly, the compounds of the present invention are antagonists of the integrin receptors αvβ3, αvβ5, and/or αvβ6 and are useful for inhibiting bone resorption, treating and preventing osteoporosis, and inhibiting vascular restenosis, diabetic retinopathy, macular degeneration, angiogenesis, atherosclerosis, inflammation, wound healing, viral disease, tumor growth, and metastasis.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application claims priority of U.S. provisional application Ser. No. 60/118,428, filed Feb. 3, 1999.

FIELD OF THE INVENTION

The present invention relates to benzazepine derivatives, their synthesis, and their use as αv integrin receptor antagonists. More particularly, the compounds of the present invention are antagonists of the integrin receptors αvβ3, αvβ5, and/or αvβ6 and are useful for inhibiting bone resorption, treating and preventing osteoporosis, and inhibiting vascular restenosis, diabetic retinopathy, macular degeneration, angiogenesis, atherosclerosis, inflammation, wound healing, viral disease, tumor growth, and metastasis.

BACKGROUND OF THE INVENTION

It is believed that a wide variety of disease states and conditions can be mediated by acting on integrin receptors and that integrin receptor antagonists represent a useful class of drugs. Integrin receptors are heterodimeric transmembrane receptors through which cells attach and communicate with extracellular matrices and other cells. (See S. B. Rodan and G. A. Rodan, “Integrin Function In Osteoclasts”, Journal of Endocrinology, Vol. 154, S47-S56 (1997), which is incorporated by reference herein in its entirety).

In one aspect of the present invention, the compounds herein are useful for inhibiting bone resorption. Bone resorption is mediated by the action of cells known as osteoclasts. Osteoclasts are large multinucleated cells of up to about 400 mm in diameter that resorb mineralized tissue, chiefly calcium carbonate and calcium phosphate, in vertebrates. Osteoclasts are actively motile cells that migrate along the surface of bone, and can bind to bone, secrete necessary acids and proteases, thereby causing the actual resorption of mineralized tissue from the bone. More specifically, osteoclasts are believed to exist in at least two physiological states, namely, the secretory state and the migratory or motile state. In the secretory state, osteoclasts are flat, attach to the bone matrix via a tight attachment zone (sealing zone), become highly polarized, form a ruffled border, and secrete lysosomal enzymes and protons to resorb bone. The adhesion of osteoclasts to bone surfaces is an important initial step in bone resorption. In the migratory or motile state, the osteoclasts migrate across bone matrix and do not take part in resorption until they again attach to bone.

αvIntegrins are involved in osteoclast attachment, activation and migration. The most abundant αv integrin in osteoclasts, e.g., in rat, chicken, mouse and human osteoclasts, is an integrin receptor known as αvβ3, which is thought to interact in bone with matrix proteins that contain the RGD sequence. Antibodies to αvβ3 block bone resorption in vitro indicating that this integrin plays a key role in the resorptive process. There is increasing evidence to suggest that αvβ3 ligands can be used effectively to inhibit osteoclast mediated bone resorption in vivo in mammals.

The current major bone diseases of public concern are osteoporosis, hypercalcemia of malignancy, osteopenia due to bone metastases, periodontal disease, hyperparathyroidism, periarticular erosions in rheumatoid arthritis, Paget's disease, immobilization-induced osteopenia, and glucocorticoid-induced osteoporosis. All of these conditions are characterized by bone loss, resulting from an imbalance between bone resorption, i.e. breakdown, and bone formation, which continues throughout life at the rate of about 14% per year on the average. However, the rate of bone turnover differs from site to site; for example, it is higher in the trabecular bone of the vertebrae and the alveolar bone in the jaws than in the cortices of the long bones. The potential for bone loss is directly related to turnover and can amount to over 5% per year in vertebrae immediately following menopause, a condition which leads to increased fracture risk.

In the United States, there are currently about 20 million people with detectable fractures of the vertebrae due to osteoporosis. In addition, there are about 250,000 hip fractures per year attributed to osteoporosis. This clinical situation is associated with a 12% mortality rate within the first two years, while 30% of the patients require nursing home care after the fracture.

Individuals suffering from all the conditions listed above would benefit from treatment with agents which inhibit bone resorption.

Additionally, αvβ3 ligands have been found to be useful in treating and/or inhibiting restenosis, i.e. recurrence of stenosis after corrective surgery on the heart valve, atherosclerosis, diabetic retinopathy, macular degeneration, and angiogenesis, i.e. formation of new blood vessels, and inhibiting viral disease. Moreover, it has been postulated that the growth of tumors depends on an adequate blood supply, which in turn is dependent on the growth of new vessels into the tumor; thus, inhibition of angiogenesis can cause tumor regression in animal models (See Harrison's Principles of Internal Medicine, 12th ed., 1991, which is incorporated by reference herein in its entirety). Therefore, αvβ3 antagonists which inhibit angiogenesis can be useful in the treatment of cancer by inhibiting tumor growth (See, e.g., Brooks et al., Cell, 79:1157-1164 (1994), which is incorporated by reference herein in its entirety).

Moreover, compounds of this invention can also inhibit neovascularization by acting as antagonists of the integrin receptor, αvβ5. A monoclonal antibody for αvβ5 has been shown to inhibit VEGF-induced angiogenesis in rabbit cornea and the chick chorioallantoic membrane model (See M. C. Friedlander, et. al., Science 270: 1500-1502 (1995), which is incorporated by reference herein in its entirety). Thus, compounds that antagonize αvβ5 are useful for treating and preventing macular degeneration, diabetic retinopathy, tumor growth, and metastasis.

Additionally, compounds of the instant invention can inhibit angiogenesis and inflammation by acting as antagonists of the integrin receptor, αvβ6, which is expressed during the later stages of wound healing and remains expressed until the wound is closed (See Christofidou-Solomidou, et al., “Expression and Function of Endothelial Cell αv Integrin Receptors in Wound-Induced Human Angiogenesis in Human Skin/SCID Mice Chimeras, American Journal of Pathology, Vol. 151, No. 4, pp. 975-983 (October 1997), which is incorporated by reference herein in its entirety). It is postulated that αvβ6 plays a role in the remodeling of the vasculature during the later stages of angiogenesis. Also, αvβ6 participates in the modulation of epithelial inflammation and is induced in response to local injury or inflammation (See Xiao-Zhu Huang, et al., “Inactivation of the Integrin β6 Subunit Gene Reveals a Role of Epithelial Integrins in Regulating Inflammation in the Lungs and Skin,” Journal of Cell Biology, Vol. 133, No.4, pp. 921-928 (May 1996), which is incorporated by reference herein in its entirety). Accordingly, compounds that antagonize αvβ6 are useful in treating or preventing cancer by inhibiting tumor growth and metastasis.

In addition, certain compounds of this invention antagonize both the αvβ3 and αvβ5 receptors. These compounds, referred to as “dual αvβ3/αvβ5 antagonists,” are useful for inhibiting bone resorption, treating and preventing osteoporosis, and inhibiting vascular restenosis, diabetic retinopathy, macular degeneration, angiogenesis, atherosclerosis, inflammation, viral disease, tumor growth, and metastasis.

In addition, certain compounds of this invention are useful as mixed αvβ3, αvβ5, and αvβ6 receptor antagonists.

Peptidyl as well as peptidomimetic antagonists of the αvβ3 integrin receptor have been described both in the scientific and patent literature. For example, reference is made to W. J. Hoekstra and B. L. Poulter, Curr. Med. Chem. 5: 195-204 (1998) and references cited therein; WO 95/32710; WO 95/37655; WO 97/37655; WO 98/08840; WO 98/18460; WO 98/18461; WO 98/25892; WO 98/31359; WO 98/30542; EP 853084; EP 854140; EP 854145; and U.S. Pat. No. 5,780,426. Evidence of the ability of αvβ3 integrin receptor antagonists to prevent bone resorption in vitro and in vivo has been presented (see V. W. Engleman et al., “A Peptidomimetic Antagonist of the αvβ3 Integrin Inhibits Bone Resorption in Vitro and Prevents Osteoporosis in Vivo,” J. Clin. Invest. 99: 2284-2292 (1997); S. B. Rodan et al., J. Bone Miner. Res. 11: S289 (1996); J. F. Gourvest et al., Bone 23: S612 (1998); M. W. Lark et al., Bone 23: S219 (1998)).

The αvβ3 integrin receptor recognizes the Arg-Gly-Asp (RGD) tripeptide sequence in its cognate matrix and cell surface glycoproteins (see J. Samanen, et al., Curr. Pharmaceut. Design 3: 545-584 (1997)). The benzazepine nucleus has been employed among others by Genentech and SmithKline Beecham as a conformationally constrained Gly-Asp mimetic to elaborate nonpeptide αvβ3 integrin receptor antagonists substituted at the N-terminus with heterocyclic arginine mimetics (see R. M. Keenan et al., “Discovery of Potent Nonpeptide Vitronectin Receptor (αvβ3) Antagonists,” J. Med. Chem. 40: 2289-2292 (1997); R. M. Keenan et al., “Benzimidazole Derivatives As Arginine Mimetics in 1,4-Benzodiazepine Nonpeptide Vitronectin Receptor (αvβ3) Antagonists,” Bioorg. Med. Chem. Lett. 8: 3165-3170 (1998); and R. M. Keenan et al., “Discovery of an Imidazopyridine-Containing 1,4-Benzodiazepine Nonpeptide Vitronectin Receptor (αvβ3) Antagonist With Efficacy in a Restenosis Model,” Bioorg. Med. Chem. Lett. 8: 3171-3176 (1998). Patents assigned to SmithKline Beecham that disclose such benzazepine-based αvβ3 integrin receptor antagonists include WO 96/00574, WO 96/00730, WO 96/06087, WO 96/26190, WO 97/24119, WO 97/24122, WO 97/24124, and WO 98/15278 and to Genentech include WO 97/34865. However, there still remains a need for small-molecule, selective αv integrin receptor antagonists that display improved potency, pharmacodynamic, and pharmacokinetic properties, such as oral bioavailability and significant duration of action. Such compounds would prove to be useful for the treatment, prevention, or suppression of various pathologies enumerated above that are mediated by αv binding and cell adhesion and activation.

It is therefore an object of the present invention to provide benzazepine derivatives which are useful as αv integrin receptor antagonists.

It is another object of the present invention to provide benzazepine derivatives which are useful as αvβ3 receptor antagonists.

It is another object of the present invention to provide benzazepine derivatives which are useful as αvβ5 receptor antagonists.

It is another object of the present invention to provide benzazepine derivatives which are useful as αvβ6 receptor antagonists.

It is another object of the present invention to provide benzazepine derivatives which are useful as dual αvβ3/αvβ5 receptor antagonists.

It is another object of the present invention to provide benzazepine derivatives which are useful as mixed αvβ3, αvβ5, and αvβ6 receptor antagonists.

It is another object of the present invention to provide pharmaceutical compositions comprising αv integrin receptor antagonists.

It is another object of the present invention to provide methods for making the pharmaceutical compositions of the present invention.

It is another object of the present invention to provide methods for eliciting an αv integrin receptor antagonizing effect in a mammal in need thereof by administering the compounds and pharmaceutical compositions of the present invention.

It is another object of the present invention to provide compounds and pharmaceutical compositions useful for inhibiting bone resorption, restenosis, atherosclerosis, inflammation, viral disease, diabetic retinopathy, macular degeneration, angiogenesis, tumor growth, and metastasis.

It is another object of the present invention to provide compounds and pharmaceutical compositions useful for treating osteoporosis.

It is another object of the present invention to provide methods for inhibiting bone resorption, restenosis, atherosclerosis, inflammation, viral disease, diabetic retinopathy, macular degeneration, angiogenesis, tumor growth, and metastasis.

It is another object of the present invention to provide methods for treating osteoporosis.

These and other objects will become readily apparent from the detailed description which follows.

SUMMARY OF THE INVENTION

The present invention relates to compounds of formula I

wherein

X is O; NR⁴; or CR¹R²;

Y is selected from the group consisting of

—(CH₂)_(m)—,

—(CH₂)_(m)—O—(CH₂)_(n)—,

—(CH₂)_(m)—NR⁴—(CH₂)_(n)—,

—(CH₂)_(m)—S—(CH₂)_(n)—,

—(CH₂)_(m)—SO—(CH₂)_(n)—,

—(CH₂)_(m)—SO—(CH₂)_(n)—,

—(CH₂)_(m)—O—(CH₂)_(n)—O—(CH₂)_(p)—,

—(CH₂)_(m)—O—(CH₂)_(n)—NR⁴—(CH₂)_(p)—,

—(CH₂)_(m)—NR⁴—(CH₂)_(n)—NR⁴—(CH₂)_(p)—,

—(CH₂)_(m)—O—(CH₂)_(n)—S—(CH₂)_(p)—,

—(CH₂)_(m)—S—(CH₂)_(n)—S—(CH₂)_(p)—,

—(CH₂)_(m)—NR⁴—(CH₂)_(n)—S—(CH₂)_(p)—,

—(CH₂)_(m)—NR⁴—(CH₂)_(n)—O—(CH₂)_(p)—,

—(CH₂)_(m)—S—(CH₂)_(n)—O—(CH₂)_(p)—, and

—(CH₂)_(m)—S—(CH₂)_(n)—NR⁴—(CH₂)_(p)—;

wherein any methylene (CH₂) carbon atom in Y, other than in R⁴, can be substituted by one or two R³ substituents;

Z is selected from the group consisting of

wherein the ring carbon atoms are unsubstituted or substituted with one or two R⁶ substituents;

R¹ and R² are each independently selected from the group consisting of

hydrogen,

halo,

C₁₋₈ alkyl,

C₂₋₈ alkenyl,

C₂₋₈ alkynyl,

C₃₋₈ cycloalkyl,

C₃₋₈ cycloheteroalkyl,

C₃₋₈ cycloalkyl C₁₋₆ alkyl,

C₃₋₈ cycloheteroalkyl C₁₋₆ alkyl,

aryl,

aryl C₁₋₆ alkyl,

amino C₁₋₆ alkyl,

C₁₋₄ acylamino C₁₋₆ alkyl,

(C₁₋₆ alkyl)_(p)amino C₁₋₆ alkyl,

hydroxy C₁₋₆ alkyl,

C₁₋₆ alkoxy C₁₋₆ alkyl,

C₁₋₆ alkylthio C₁₋₆ alkyl,

hydroxycarbonyl C₁₋₆ alkyl,

C₁₋₄ alkoxycarbonyl C₁₋₆ alkyl, and

trifluoromethyl;

each R³ is independently selected from the group consisting of

hydrogen,

halo,

aryl,

C₁₋₈ alkyl,

C₂₋₈ alkenyl,

C₂₋₈ alkynyl,

aryl C₁₋₆ alkyl,

C₃₋₈ cycloalkyl,

hydroxyl,

oxo,

trifluoromethyl,

C₁₋₆ alkoxy,

aryl C₁₋₆ alkoxy,

C₁₋₆ alkylthio,

aryl C₁₋₆ alkylthio,

aminocarbonyl,

(C₁₋₆ alkyl)_(p)aminocarbonyl,

arylaminocarbonyl,

aryl C₁₋₆ alkylaminocarbonyl,

aryloxycarbonylamino,

C₁₋₆ alkoxycarbonylamino,

aryl C₁₋₆ alkoxycarbonylamino,

arylcarbonylamino

C₁₋₆ alkylcarbonylamino,

aryl C₁₋₆ alkylcarbonylamino,

(C₁₋₆ alkyl)_(p)aminocarbonyloxy,

C₁₋₆ alkylsulfonylamino,

arylsulfonylamino,

aryl C₁₋₆ alkylsulfonylamino,

C₁₋₆ alkylsulfonyl,

aryl C₁₋₆ alkylsulfonyl,

C₁₋₆ alkylcarbonyl, and

aryl C₁₋₆ alkylcarbonyl;

or two R³ substituents, when on the same carbon atom are taken together with the carbon atom to which they are attached to form a carbonyl group or a cyclopropyl group,

wherein any of the alkyl groups of R³ are either unsubstituted or substituted with one to three R¹ substituents, and provided that each R³ is selected such that in the resultant compound the carbon atom or atoms to which R³ is attached is itself attached to no more than one heteroatom;

each R⁴ is independently selected from the group consisting of

hydrogen,

C₁₋₈ alkyl,

C₂₋₈ alkenyl,

C₂₋₈ alkynyl,

aryl C₁₋₆ alkyl,

C₁₋₄ alkoxy C₁₋₆ alkyl,

C₃₋₈ cycloalkyl,

C₁₋₆ alkylsulfonyl,

arylsulfonyl,

arylC₁₋₆ alkylsulfonyl,

C₁₋₆ alkoxycarbonyl,

aryloxycarbonyl,

aryl C₁₋₆ alkoxycarbonyl,

C₁₋₆ alkylcarbonyl,

arylcarbonyl,

aryl C₁₋₆ alkylcarbonyl,

hydroxycarbonyl C₁₋₆ alkyl,

C₁₋₄ alkoxycarbonyl C₁₋₆ alkyl,

(aryl)_(p)aminocarbonyl,

(aryl C₁₋₆ alkyl)_(p)aminocarbonyl, and

(C₁₋₆ alkyl)_(p)aminocarbonyl;

wherein any of the alkyl groups of R⁴ are either unsubstituted or substituted with one to three R¹ substituents;

R⁵ is selected from the group consisting of

hydrogen,

C₁₋₈ alkyl,

aryl,

aryl C₁₋₆ alkyl,

C₁₋₆ alkylcarbonyloxy C₁₋₄ alkyl,

aryl C₁₋₆ alkylcarbonyloxy C₁₋₄ alkyl,

C₁₋₆ alkylaminocarbonylmethylene, and

C₁₋₆ dialkylaminocarbonylmethylene;

each R⁶ is selected from the group consisting of

hydrogen,

cyano,

nitro,

halo,

C₁₋₈ alkyl,

C₂₋₈ alkenyl,

C₂₋₈ alkynyl,

C₃₋₈ cycloalkyl,

C₃₋₈ cycloheteroalkyl,

C₃₋₈ cycloalkyl C₁₋₆ alkyl,

C₃₋₈ cycloheteroalkyl C₁₋₆ alkyl,

aryl,

aryl C₁₋₆ alkyl,

amino,

C₁₋₄ acylamino,

(C₁₋₆ alkyl)_(p)amino,

C₁₋₆ alkoxy,

C₁₋₆ alkylthio,

hydroxycarbonyl,

aminocarbonyl,

(C₁₋₆ alkyl)_(p)aminocarbonyl,

C₁₋₄ alkoxycarbonyl,

hydroxy,

trifluoromethyl, and

trifluoromethoxy;

R⁷ is selected from the group consisting of

hydrogen,

C₁₋₈ alkyl,

C₂₋₈ alkenyl,

C₂₋₈ alkynyl,

C₃₋₈ cycloalkyl,

C₃₋₈ cycloheteroalkyl,

C₃₋₈ cycloalkyl C₁₋₆ alkyl,

C₃₋₈ cycloheteroalkyl C₁₋₆ alkyl, and aryl C₁₋₆ alkyl;

R⁸ is selected from the group consisting of

hydrogen,

aryl,

C₁₋₈ alkyl,

C₂₋₈ alkenyl,

C₂₋₈ alkynyl,

C₃₋₈ cycloalkyl,

C₃₋₈ cycloheteroalkyl,

C₃₋₈ cycloalkyl C₁₋₆ alkyl,

C₃₋₈ cycloheteroalkyl C₁₋₆ alkyl

aryl C₁₋₆ alkyl,

trifluoromethyl,

2,2,2-trifluoroethyl,

hydroxycarbonyl C₁₋₆ alkyl,

C₁₋₄ alkoxycarbonyl C₁₋₆ alkyl, and

C₁₋₄ alkoxy C₁₋₆ alkyl;

each m is independently an integer from 0 to 6;

each n is independently an integer from 0 to 6; and

each p is independently an integer from 0 to 2;

or a pharmaceutically acceptable salt thereof.

The present invention also relates to pharmaceutical compositions comprising the compounds of the present invention and a pharmaceutically acceptable carrier.

The present invention also relates to methods for making the pharmaceutical compositions of the present invention.

The present invention also relates to methods for eliciting an αv integrin receptor antagonizing effect in a mammal in need thereof by administering the compounds and pharmaceutical compositions of the present invention.

The present invention also relates to methods for inhibiting bone resorption, restenosis, atherosclerosis, inflammation, viral disease, diabetic retinopathy, macular degeneration, angiogenesis, wound healing, tumor growth, and metastasis by administering the compounds and pharmaceutical compositions of the present invention.

The present invention also relates to methods for treating osteoporosis by administering the compounds and pharmaceutical compositions of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to compounds useful as αv integrin receptor antagonists. Representative compounds of the present invention are described by structural formula I:

wherein

X is O; NR⁴; or CR¹R²;

Y is selected from the group consisting of

—(CH₂)_(m)—,

—(CH₂)_(m)—O—(CH₂)_(n)—,

—(CH₂)_(m)—NR⁴—(CH₂)_(n)—,

—(CH₂)_(m)—S—(CH₂)_(n)—,

—(CH₂)_(m)—SO—(CH₂)_(n)—,

—(CH₂)_(m)—SO₂—(CH₂)_(n)—,

—(CH₂)_(m)—O—(CH₂)_(n)—O—(CH₂)_(p)—,

—(CH₂)_(m)—O—(CH₂)_(n)—NR⁴—(CH₂)_(p)—,

—(CH₂)_(m)—NR⁴—(CH₂)_(n)—NR⁴—(CH₂)_(p)—,

—(CH₂)_(m)—O—(CH₂)_(n)—S—(CH₂)_(p)—,

—(CH₂)_(m)—S—(CH₂)_(n)—S—(CH₂)_(p)—,

—(CH₂)_(m)—NR⁴—(CH₂)_(n)—S—(CH₂)_(p)—,

—(CH₂)_(m)—NR⁴—(CH₂)_(n)—O—(CH₂)_(p)—,

—(CH₂)_(m)—S—(CH₂)_(n)—O—(CH₂)_(p)—, and

—(CH₂)_(m)—S—(CH₂)_(n)—NR⁴—(CH₂)_(p)—;

wherein any methylene (CH₂) carbon atom in Y, other than in R⁴, can be substituted by one or two R³ substituents;

Z is selected from the group consisting of

wherein the ring carbon atoms are unsubstituted or substituted with one or two R⁶ substituents;

R¹ and R² are each independently selected from the group consisting of

hydrogen,

halo,

C₁₋₈ alkyl,

C₂₋₈ alkenyl,

C₂₋₈ alkynyl,

C₃₋₈ cycloalkyl,

C₃₋₈ cycloheteroalkyl,

C₃₋₈ cycloalkyl C₁₋₆ alkyl,

C₃₋₈ cycloheteroalkyl C₁₋₆ alkyl,

aryl,

aryl C₁₋₆ alkyl,

amino C₁₋₆ alkyl,

C₁₋₄ acylamino C₁₋₆ alkyl,

(C₁₋₆ alkyl)_(p)amino C₁₋₆ alkyl,

hydroxy C₁₋₆ alkyl,

C₁₋₆ alkoxy C₁₋₆ alkyl,

C₁₋₆ alkylthio C₁₋₆ alkyl,

hydroxycarbonyl C₁₋₆ alkyl,

C₁₋₄ alkoxycarbonyl C₁₋₆ alkyl, and

trifluoromethyl;

each R³ is independently selected from the group consisting of

hydrogen,

halo,

aryl,

C₁₋₈ alkyl,

C₂₋₈ alkenyl,

C₂₋₈ alkynyl,

aryl C₁₋₆ alkyl,

C₃₋₈ cycloalkyl,

hydroxyl,

oxo,

trifluoromethyl,

C₁₋₆ alkoxy,

aryl C₁₋₆ alkoxy,

C₁₋₆ alkylthio,

aryl C₁ ₆ alkylthio,

aminocarbonyl,

(C₁₋₆ alkyl)_(p)aminocarbonyl,

arylaminocarbonyl,

aryl C₁₋₆ alkylaminocarbonyl,

aryloxycarbonylamino,

C₁₋₆ alkoxycarbonylamino,

aryl C₁₋₆ alkoxycarbonylamino,

arylcarbonylamino

C₁₋₆ alkylcarbonylamino,

aryl C₁₋₆ alkylcarbonylamino,

(C₁₋₆ alkyl)_(p)aminocarbonyloxy,

C₁₋₆ alkylsulfonylamino,

arylsulfonylamino,

aryl C₁₋₆ alkylsulfonylamino,

C₁₋₆ alkylsulfonyl,

aryl C₁₋₆ alkylsulfonyl,

C₁₋₆ alkylcarbonyl, and

aryl C₁₋₆ alkylcarbonyl;

or two R³ substituents, when on the same carbon atom are taken together with the carbon atom to which they are attached to form a carbonyl group or a cyclopropyl group,

wherein any of the alkyl groups of R³ are either unsubstituted or substituted with one to three R¹ substituents, and provided that each R³ is selected such that in the resultant compound the carbon atom or atoms to which R³ is attached is itself attached to no more than one heteroatom;

each R⁴ is independently selected from the group consisting of

hydrogen,

C₁₋₈ alkyl,

C₂₋₈ alkenyl,

C₂₋₈ alkynyl,

aryl C₁₋₆ alkyl,

C₁₋₄ alkoxy C ₁₋₆ alkyl,

C₃₋₈ cycloalkyl,

C₁₋₆ alkylsulfonyl,

arylsulfonyl,

arylC₁₋₆ alkylsulfonyl,

C₁₋₆ alkoxycarbonyl,

aryloxycarbonyl,

aryl C₁₋₆ alkoxycarbonyl,

C₁₋₆ alkylcarbonyl,

arylcarbonyl,

aryl C₁₋₆ alkylcarbonyl,

hydroxycarbonyl C₁₋₆ alkyl,

C₁₋₄ alkoxycarbonyl C₁₋₆ alkyl,

(aryl)_(p)aminocarbonyl,

(aryl C₁₋₆ alkyl)_(p)aminocarbonyl, and

(C₁₋₆ alkyl)_(p)aminocarbonyl;

wherein any of the alkyl groups of R⁴ are either unsubstituted or substituted with one to three R¹ substituents;

R⁵ is selected from the group consisting of

hydrogen,

C₁₋₈ alkyl,

aryl,

aryl C₁₋₆ alkyl,

C₁₋₆ alkylcarbonyloxy C₁₋₄ alkyl,

aryl C₁₋₆ alkylcarbonyloxy C₁₋₄ alkyl,

C₁₋₆ alkylaminocarbonylmethylene, and

C₁₋₆ dialkylaminocarbonylmethylene;

each R⁶ is selected from the group consisting of

hydrogen,

cyano,

nitro,

halo,

C₁₋₈ alkyl,

C₂₋₈ alkenyl,

C₂₋₈ alkynyl,

C₃₋₈ cycloalkyl,

C₃₋₈ cycloheteroalkyl,

C₃₋₈ cycloalkyl C₁₋₆ alkyl,

C₃₋₈ cycloheteroalkyl C₁₋₆ alkyl,

aryl,

aryl C₁₋₆ alkyl,

amino,

C₁₋₄ acylamino,

(C₁₋₆ alkyl)_(p)amino,

C₁₋₆ alkoxy,

C₁₋₆ alkylthio,

hydroxycarbonyl,

aminocarbonyl,

(C₁₋₆ alkyl)_(p)aminocarbonyl,

C₁₋₄ alkoxycarbonyl,

hydroxy,

trifluoromethyl, and

trifluoromethoxy;

R⁷ is selected from the group consisting of

hydrogen,

C₁₋₈ alkyl,

C₂₋₈ alkenyl,

C₂₋₈ alkynyl,

C₃₋₈ cycloalkyl,

C₃₋₈ cycloheteroalkyl,

C₃₋₈ cycloalkyl C₁₋₆ alkyl,

C₃₋₈ cycloheteroalkyl C₁₋₆ alkyl, and

aryl C₁₋₆ alkyl;

R⁸ is selected from the group consisting of

hydrogen,

aryl,

C₁₋₈ alkyl,

C₂₋₈ alkenyl,

C₂₋₈ alkynyl,

C₃₋₈ cycloalkyl,

C₃₋₈ cycloheteroalkyl,

C₃₋₈ cycloalkyl C₁₋₆ alkyl,

C₃₋₈ cycloheteroalkyl C₁₋₆ alkyl

aryl C₁₋₆ alkyl,

trifluoromethyl,

2,2,2-trifluoroethyl,

hydroxycarbonyl C₁₋₆ alkyl,

C₁₋₄ alkoxycarbonyl C₁₋₆ alkyl, and

C₁₋₄ alkoxy C₁₋₆ alkyl;

each m is independently an integer from 0 to 6;

each n is independently an integer from 0 to 6; and

each p is independently an integer from 0 to 2;

or a pharmaceutically acceptable salt thereof.

In the compounds of the present invention, X is preferably NR⁴ wherein R⁴ is as defined above.

In the compounds of the present invention, Y is preferably selected from the group consisting of

—(CH₂)_(m)—,

—(CH₂)_(m)—O—(CH₂)_(n)—,

—(CH₂)_(m)—NR⁴—(CH₂)_(n)—,

—(CH₂)_(m)—S—(CH₂)_(n)—,

—(CH₂)_(m)—SO—(CH₂)_(n)—,

—(CH₂)_(m)—SO₂—(CH₂)_(n)—,

—(CH₂)_(m)—O—(CH₂)_(n)—O—(CH₂)_(p)—,

—(CH₂)_(m)—O—(CH₂)_(n)—NR⁴—(CH₂)_(p)—,

—(CH₂)_(m)—NR⁴—(CH₂)_(n)—NR⁴—(CH₂)_(p)—, and

—(CH₂)_(m)—NR⁴—(CH₂)_(n)—O—(CH₂)_(p)—,

wherein any methylene (CH₂) carbon atom in Y, other than in R⁴, can be substituted by one or two R³ substituents. More preferably Y is selected from the group consisting of

—(CH₂)_(m)—,

—(CH₂)_(m)—O—(CH₂)_(n)—,

—(CH₂)_(m)—NR⁴—(CH₂)_(n)—, and

—(CH₂)_(m)—S—(CH₂)_(n)—,

wherein any methylene (CH₂) carbon atom in Y, other than in R⁴, can be substituted by one or two R³ substituents. Most preferably Y is

—(CH₂)_(m)—NR⁴—(CH₂)_(n)—,

wherein any methylene (CH₂) carbon atom in Y, other than in R⁴, can be substituted by one or two R³ substituents;

In the compounds of the present invention, Z is preferably

wherein the ring carbon atoms are unsubstituted or substituted with one or two R⁶ substituents as defined above. More preferably Z is

wherein the ring carbon atoms are unsubstituted or substituted with one or two R⁶ substituents as defined above.

In the compounds of the present invention, R¹ and R² are preferably independently selected from the group consisting of

hydrogen,

C₁₋₆ alkyl,

C₃₋₈ cycloalkyl,

C₃₋₈ cycloheteroalkyl, and

aryl C₁₋₃ alkyl.

More preferably R¹ and R² are independently selected from hydrogen and C₁₋₃ alkyl. Most preferably R¹ and R² are each hydrogen.

In the compounds of the present invention, each R³ is preferably selected from the group consisting of

hydrogen,

aryl,

C₁₋₈ alkyl,

aryl C₁₋₆ alkyl,

fluoro,

hydroxy,

oxo,

trifluoromethyl,

aminocarbonyl,

arylaminocarbonyl,

aryl C₁₋₆ alkylaminocarbonyl, and

(C₁₋₆ alkyl)_(p)aminocarbonyl.

More preferably R³ is hydrogen or oxo. Most preferably R³ is oxo.

In the compounds of the present invention, each R⁴ is preferably selected from the group consisting of

hydrogen,

C₁₋₈ alkyl,

aryl C₁₋₆ alkyl,

C₃₋₈ cycloalkyl,

C₁₋₄ alkoxy C₁-6 alkyl,

C₁₋₆ alkylsulfonyl,

arylC₁₋₆ alkylsulfonyl,

C₁₋₆ alkoxycarbonyl,

aryl C₁₋₆ alkoxycarbonyl,

C₁₋₆ alkylcarbonyl,

arylcarbonyl,

aryl C₁₋₆ alkylcarbonyl,

(aryl)_(p)aminocarbonyl,

(aryl C₁₋₆ alkyl)_(p)aminocarbonyl, and

(C₁₋₆ alkyl)_(p)aminocarbonyl.

More preferably, R⁴ is selected from the group consisting of

hydrogen,

C₁₋₄ alkyl,

aryl C₁₋₄ alkyl, and

C₁₋₄ alkoxy C₁₋₄ alkyl.

Most preferably R⁴ is hydrogen or methyl.

In a further embodiment of the compounds of the present invention, R⁴ is methyl.

In the compounds of the present invention, R⁵ is preferably selected from the group consisting of hydrogen, methyl, and ethyl.

More preferably, R⁵ is hydrogen.

In the compounds of the present invention, each R⁶ is preferably selected from the group consisting of

hydrogen,

cyano,

halo,

C₁₋₄ alkyl,

aryl,

aryl C₁₋₃ alkyl,

C₁₋₄ acylamino,

C₁₋₄ alkoxy,

C₁₋₄ alkylthio,

aminocarbonyl,

(C₁₋₆ alkyl)_(p)aminocarbonyl,

C₁₋₄ alkoxycarbonyl,

trifluoromethyl, and

trifluoromethoxy.

In the compounds of the present invention, R⁷ is preferably hydrogen, C₁₋₃ alkyl, or aryl C₁₋₃ alkyl. More preferably R⁷ is hydrogen.

In the compounds of the present invention, R⁸ is preferably selected from the group consisting of

hydrogen,

C₁₋₄ alkyl,

aryl C₁₋₄ alkyl,

trifluoromethyl,

2,2,2-trifluoroethyl, and

C₁₋₄ alkoxy C₁₋₄ alkyl.

More preferably R⁸ is hydrogen or methyl. Most preferably R⁸ is methyl.

In the compounds of the present invention, m and n are preferably integers from 1 to 3, more preferably from 1 to 2. Most preferably m and n are both 1.

In the compounds of the present invention, the preferred absolute stereochemistry at the C-2 stereogenic center of the benzodiazepine ring is “S”.

An illustrative but nonlimiting example of compounds of the present invention that are useful as αv integrin receptor antagonists is {4-Methyl-7-[N-methyl-(5,6,7,8-tetrahydro-[1,8]naphthyridin-2-ylmethyl)-carbamoyl]-3-oxo-2,3,4,5-tetrahydro-1H-benzo[e][1,4]diazepin-2(S)-yl}-acetic acid, or a pharmaceutically acceptable salt thereof.

For use in medicine, the salts of the compounds of this invention refer to non-toxic “pharmaceutically acceptable salts.” Other salts may, however, be useful in the preparation of the compounds according to the invention or of their pharmaceutically acceptable salts. Salts encompassed within the term “pharmaceutically acceptable salts” refer to non-toxic salts of the compounds of this invention which are generally prepared by reacting the free base with a suitable organic or inorganic acid. Representative salts include the following: acetate, benzenesulfonate, benzoate, bicarbonate, bisulfate, bitartrate, borate, bromide, calcium, camsylate, carbonate, chloride, clavulanate, citrate, dihydrochloride, edetate, edisylate, estolate, esylate, fumarate, gluceptate, gluconate, glutamate, glycollylarsanilate, hexylresorcinate, hydrabamine, hydrobromide, hydrochloride, hydroxynaphthoate, iodide, isothionate, lactate, lactobionate, laurate, malate, maleate, mandelate, mesylate, methylbromide, methylnitrate, methylsulfate, mucate, napsylate, nitrate, N-methylglucamine ammonium salt, oleate, oxalate, pamoate (embonate), palmitate, pantothenate, phosphate/diphosphate, polygalacturonate, salicylate, stearate, sulfate, subacetate, succinate, tannate, tartrate, teoclate, tosylate, triethiodide and valerate. Furthermore, where the compounds of the invention carry an acidic moiety, suitable pharmaceutically acceptable salts thereof may include alkali metal salts, e.g., sodium or potassium salts; alkaline earth metal salts, e.g., calcium or magnesium salts; and salts formed with suitable organic ligands, e.g., quaternary ammonium salts.

The compounds of the present invention can have chiral centers and can thus occur as racemates, racemic mixtures, single enantiomers, diastereomeric mixtures, and individual diastereomers, with all isomeric forms being included in the present invention. Therefore, where a compound is chiral, the separate enantiomers or diastereomers, substantially free of the other, are included within the scope of the invention; further included are all mixtures of the two enantiomers.

Some of the compounds described herein contain olefinic double bonds, and unless specified otherwise, are meant to include both E and Z geometric isomers.

Some of the compounds described herein may exist with different points of attachment of hydrogen, referred to as tautomers. Such an example may be a ketone and its enol form, known as keto-enol tautomers. The individual tautomers as well as mixtures thereof are encompassed within the compounds of the present invention.

Compounds of the present invention may be separated into diastereoisomeric pairs of enantiomers by, for example, fractional crystallization from a suitable solvent, for example, methanol or ethyl acetate or a mixture thereof. The pair of enantiomers thus obtained may be separated into individual stereoisomers by conventional means, for example, by the use of an optically active acid as a resolving agent, or by HPLC using a chiral stationary phase. Alternatively, any enantiomer of a compound of the present invention may be obtained by stereospecific synthesis using optically pure starting materials or reagents of known configuration.

Also included within the scope of the invention are polymorphs and hydrates of the compounds of the instant invention.

The present invention includes within its scope prodrugs of the compounds of this invention. In general, such prodrugs will be functional derivatives of the compounds of this invention which are readily convertible in vivo into the required compound. Thus, in the methods of treatment of the present invention, the term “administering” shall encompass the treatment of the various conditions described with the compound specifically disclosed or with a compound which may not be specifically disclosed, but which converts to the specified compound in vivo after administration to the patient. Conventional procedures for the selection and preparation of suitable prodrug derivatives are described, for example, in “Design of Prodrugs,” ed. H. Bundgaard, Elsevier, 1985, which is incorporated by reference herein in its entirety. Metabolites of these compounds include active species produced upon introduction of compounds of this invention into the biological milieu.

The term “therapeutically effective amount” shall mean that amount of a drug or pharmaceutical agent that will elicit the biological or medical response of a tissue, system, animal or human that is being sought by a researcher or clinician.

The term “αv integrin receptor antagonist,” as used herein, refers to a compound which binds to and antagonizes either the αvβ3 receptor, the αvβ5 receptor, or the αvβ6 receptor, or a compound which binds to and antagonizes combinations of these receptors (for example, a dual αvβ3/αvβ5 receptor antagonist).

The term “bone resorption,” as used herein, refers to the process by which osteoclasts degrade bone.

The term “alkyl” shall mean straight or branched chain alkanes of one to ten total carbon atoms, or any number within this range (i.e., methyl, ethyl, 1-propyl, 2-propyl, n-butyl, s-butyl, t-butyl, etc.).

The term “alkenyl” shall mean straight or branched chain alkenes of two to ten total carbon atoms, or any number within this range.

The term “alkynyl” shall mean straight or branched chain alkynes of two to ten total carbon atoms, or any number within this range.

The term “cycloalkyl” shall mean cyclic rings of alkanes of three to eight total carbon atoms, or any number within this range (i.e., cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl or cyclooctyl).

The term “cycloheteroalkyl,” as used herein, shall mean a 3- to 8-membered fully saturated heterocyclic ring containing one or two heteroatoms chosen from N, O, or S. Examples of cycloheteroalkyl groups include, but are not limited to, piperidinyl, pyrrolidinyl, azetidinyl, morpholinyl, and piperazinyl.

The term “alkoxy,” as used herein, refers to straight or branched chain alkoxides of the number of carbon atoms specified (e.g., C₁₋₅ alkoxy), or any number within this range (i.e., methoxy, ethoxy, etc.). The term “alkylthio,” as used herein, refers to straight or branched chain alkylsulfides of the number of carbon atoms specified (e.g., C₁₋₅ alkylthio), or any number within this range (i.e., methylthio, ethylthio, etc.).

The term “aryl,” as used herein, refers to a monocyclic or polycyclic system comprising at least one aromatic ring, wherein the monocylic or polycyclic system contains 0, 1, 2, 3, or 4 heteroatoms chosen from N, O, or S, and wherein the monocylic or polycylic system is either unsubstituted or substituted with one or more groups independently selected from hydrogen, halogen, C₁₋₁₀ alkyl, C₃₋₈ cycloalkyl, aryl, aryl C₁₋₈ alkyl, amino, amino-C₁₋₈ alkyl, C₁₋₃ acylamino, C₁₋₃ acylamino-C₁₋₈ alkyl, C₁₋₆ alkylamino, C₁₋₆ alkylamino C₁₋₈ alkyl, C₁₋₆ dialkylamino, C₁₋₆ dialkylamino-C₁₋₈ alkyl, C₁₋₄ alkoxy, C₁₋₄ alkoxy C₁₋₆ alkyl, C₁₋₄ alkylthio C₁₋₄ alkylthio C₁₋₆ alkyl hydroxycarbonyl, hydroxycarbonyl C₁₋₆ alkyl, C₁₋₅ alkoxycarbonyl, C₁₋₃ alkoxycarbonyl C₁₋₆ alkyl, hydroxycarbonyl C₁₋₆ alkyloxy, hydroxy, hydroxy C₁₋₆ alkyl, cyano, nitro, trifluoromethyl, trifluoromethoxy, trifluoroethoxy, oxo, thioxo, or C₁₋₅ alkylcarbonyloxy. Examples of aryl include, but are not limited to, phenyl, naphthyl, pyridyl, quinolyl, pyrrolyl, pyrazolyl, pyrazinyl, pyrimidyl, imidazolyl, tetrazolyl, benzofuranyl, benzothiophenyl, benzimidazolyl, benzthiazolyl, benzoxazolyl, indolyl, thienyl, furyl, dihydrobenzofuryl, benzo(1,3) dioxolane, oxazolyl, isoxazolyl, oxadiazolyl, thiazolyl, and isothiazolyl, which are either unsubstituted or substituted with one or more groups independently selected from hydrogen, halogen, C₁₋₁₀ alkyl, C₃₋₈ cycloalkyl, aryl, aryl C₁₋₈ alkyl, amino, amino C₁₋₈ alkyl, C₁₋₃ acylamino, C₁₋₃ acylamino C₁₋₈ alkyl, C₁₋₆ alkylamino, C₁₋₆ alkylamino-C₁₋₈ alkyl, C₁₋₆ dialkylamino, C₁₋₆ dialkylamino C₁₋₈ alkyl, C₁₋₄ alkoxy, C₁₋₄ alkoxy C₁₋₆ alkyl, hydroxycarbonyl, hydroxycarbonyl C₁₋₆ alkyl, C₁₋₅ alkoxycarbonyl, C₁₋₃ alkoxycarbonyl C1-6 alkyl, hydroxycarbonyl C₁₋₆ alkoxy, hydroxy, hydroxy C₁₋₆ alkyl, cyano, trifluoromethyl, oxo or C₁₋₅ alkylcarbonyloxy. Preferably, the aryl group is unsubstituted, mono-, di-, tri- or tetra-substituted with one to four of the above-named substituents; more preferably, the aryl group is unsubstituted, mono-, di- or tri-substituted with one to three of the above-named substituents; most preferably, the aryl group is unsubstituted, mono- or di-substituted with one to two of the above-named substituents.

Whenever the term “alkyl” or “aryl” or either of their prefix roots appears in a name of a substituent (e.g., aryl C₁₋₆ alkyl), it shall be interpreted as including those limitations given above for “alkyl” and “aryl.” Designated numbers of carbon atoms (e.g., C₁₋₈) shall refer independently to the number of carbon atoms in an alkyl or cyclic alkyl moiety or to the alkyl portion of a larger substituent in which alkyl appears as its prefix root.

The terms “arylalkyl” and “alkylaryl” include an alkyl portion where alkyl is as defined above and to include an aryl portion where aryl is as defined above. Examples of arylalkyl include, but are not limited to, benzyl, fluorobenzyl, chlorobenzyl, phenylethyl, phenylpropyl, fluorophenylethyl, chlorophenylethyl, thienylmethyl, thienylethyl, and thienylpropyl. Examples of alkylaryl include, but are not limited to, toluene, ethylbenzene, propylbenzene, methylpyridine, ethylpyridine, propylpyridine and butylpyridine.

In the compounds of the present invention, two R¹ substituents, when on the same carbon atom, can be taken together with the carbon atom to which they are attached to form a carbonyl group.

In the compounds of the present invention, two R³ substituents, when on the same carbon atom, can be taken together with the carbon atom to which they are attached to form a carbonyl group. In such instances, the limitation, that in the resultant compound the carbon atom or atoms at which R³ is attached is itself attached to no more than one heteroatom, does not apply. Also, two R³ substituents, when on the same carbon atom, can be taken together with the carbon atom to which they are attached to form a cyclopropyl group.

The term “halo” shall include iodo, bromo, chloro, and fluoro.

The term “oxy” means an oxygen (O) atom. The term “thio” means a sulfur (S) atom. The term “oxo” means “═O”. The term “carbonyl” means “C═O.” The term “thioxo” means “C═S.”

The term “substituted” shall be deemed to include multiple degrees of substitution by a named substitutent. Where multiple substituent moieties are disclosed or claimed, the substituted compound can be independently substituted by one or more of the disclosed or claimed substituent moieties, singly or plurally. By independently substituted, it is meant that the (two or more) substituents can be the same or different.

Under standard nonmenclature used throughout this disclosure, the terminal portion of the designated side chain is described first, followed by the adjacent functionality toward the point of attachment. For example, a C₁₋₅ alkylcarbonylamino C₁₋₆ alkyl substituent is equivalent to

In choosing compounds of the present invention, one of ordinary skill in the art will recognize that the various substituents, i.e. X, Y, Z, R¹, R², R³, R⁴, and R⁵, and the subscripts m, n, and p are to be chosen in conformity with well-known principles of chemical structure connectivity.

Representative compounds of the present invention typically display submicromolar affinity for the integrin receptors, particularly the αvβ3, αvβ5, and/or αvβ6 receptors. Compounds of this invention are therefore useful for treating mammals suffering from a bone condition caused or mediated by increased bone resorption, who are in need of such therapy. Pharmacologically effective amounts of the compounds, including pharamaceutically acceptable salts thereof, are administered to the mammal, to inhibit the activity of mammalian osteoclasts.

The compounds of the present invention are administered in dosages effective to antagonize the αvβ3 receptor where such treatment is needed, as, for example, in the prevention or treatment of osteoporosis.

Further exemplifying the invention is the method wherein the αv integrin receptor antagonizing effect is an αvβ3 antagonizing effect. An illustration of the invention is the method wherein the αvβ3 antagonizing effect is selected from inhibition of bone resorption, restenosis, angiogenesis, diabetic retinopathy, macular degeneration, inflammation, viral disease, tumor growth, or metastasis. Preferably, the αvβ3 antagonizing effect is the inhibition of bone resorption.

An example of the invention is the method wherein the αv integrin receptor antagonizing effect is an αvβ5 antagonizing effect. More specifically, the αvβ5 antagonizing effect is selected from inhibition of restenosis, angiogenesis, diabetic retinopathy, macular degeneration, inflammation, tumor growth, or metastasis.

Illustrating the invention is the method wherein the αv integrin receptor antagonizing effect is a dual αvβ3/αvβ5 antagonizing effect. More particularly, the dual αvβ3/αvβ5 antagonizing effect is selected from inhibition of: bone resorption, restenosis, angiogenesis, diabetic retinopathy, macular degeneration, inflammation, viral disease, tumor growth, or metastasis.

Illustrating the invention is the method wherein the αv integrin receptor antagonizing effect is an αvβ6 antagonizing effect. More particularly, the αvβ6 antagonizing effect is selected from inhibition of angiogenesis, inflammatory response, or wound healing.

Illustrating the invention is the method wherein the αvβ3 antagonizing effect is selected from inhibition of bone resorption, inhibition of restenosis, inhibition of angiogenesis, inhibition of diabetic retinopathy, inhibition of macular degeneration, inhibition of atherosclerosis, inflammation, viral disease, or inhibition of tumor growth and metastasis. Preferably, the αvβ3 antagonizing effect is the inhibition of bone resorption.

More particularly illustrating the invention is a pharmaceutical composition comprising any of the compounds described above and a pharmaceutically acceptable carrier. Another example of the invention is a pharmaceutical composition made by combining any of the compounds described above and a pharmaceutically acceptable carrier. Another illustration of the invention is a process for making a pharmaceutical composition comprising combining any of the compounds described above and a pharmaceutically acceptable carrier.

Further illustrating the invention is a method of treating and/or preventing a condition mediated by antagonism of an αv integrin receptor in a mammal in need thereof, comprising administering to the mammal a therapeutically effective amount of any of the compounds described above. Preferably, the condition is selected from bone resorption, osteoporosis, restenosis, diabetic retinopathy, macular degeneration, angiogenesis, atherosclerosis, inflammation, viral disease, cancer, tumor growth, and metastasis. More preferably, the condition is selected from osteoporosis and cancer. Most preferably, the condition is osteoporosis.

More specifically exemplifying the invention is a method of eliciting an αv integrin antagonizing effect in a mammal in need thereof, comprising administering to the mammal a therapeutically effective amount of any of the compounds or any of the pharmaceutical compositions described above. Preferably, the αv integrin antagonizing effect is an αvβ3 antagonizing effect; more specifically the αvβ3 antagonizing effect is selected from inhibition of bone resorption, inhibition of restenosis, inhibition of atherosclerosis, inhibition of angiogenesis, inhibition of diabetic retinopathy, inhibition of macular degeneration, inhibition of inflammation, inhibition of viral disease, or inhibition of tumor growth or metastasis. Most preferably, the αvβ3 antagonizing effect is inhibition of bone resorption. Alternatively, the αv integrin antagonizing effect is an αvβ5 antagonizing effect, an αvβ6 antagonizing effect, or a mixed αvβ3, αvβ5, and αvβ6 antagonizing effect. Examples of αvβ5 antagonizing effects are inhibition of restenosis, atherosclerosis, angiogenesis, diabetic retinopathy, macular degeneration, inflammation, or tumor growth. Examples of αvβ6 antagonizing effects are inhibition of angiogenesis, inflammatory response, and wound healing.

Additional examples of the invention are methods of inhibiting bone resorption and of treating and/or preventing osteoporosis in a mammal in need thereof, comprising administering to the mammal a therapeutically effective amount of any of the compounds or any of the pharmaceutical compositions decribed above.

Additional illustrations of the invention are methods of treating hypercalcemia of malignancy, osteopenia due to bone metastases, periodontal disease, hyperparathyroidism, periarticular erosions in rheumatoid arthritis, Paget's disease, immobilization-induced osteopenia, and glucocorticoid treatment in a mammal in need thereof, comprising administering to the mammal a therapeutically effective amount of any of the compounds or any of the pharmaceutical compositions described above.

More particularly exemplifying the invention is the use of any of the compounds described above in the preparation of a medicament for the treatment and/or prevention of osteoporosis in a mammal in need thereof. Still further exemplifying the invention is the use of any of the compounds described above in the preparation of a medicament for the treatment and/or prevention of bone resorption, tumor growth, cancer, restenosis, atherosclerosis, diabetic retinopathy, macular degeneration, inflammation, viral disease, and/or angiogenesis.

Also exemplifying the invention are compositions further comprising an active ingredient selected from the group consisting of

a.) an organic bisphosphonate or a pharmaceutically acceptable salt or ester thereof,

b.) an estrogen receptor modulator,

c.) a cytotoxic/antiproliferative agent,

d.) a matrix metalloproteinase inhibitor,

e.) an inhibitor of epidermal-derived, fibroblast-derived, or platelet-derived growth factors,

f.) an inhibitor of VEGF,

g.) an inhibitor of Flk-1/KDR, Flt-1, Tck/Tie-2, or Tie-1,

h.) a cathepsin K inhibitor, and

i.) a prenylation inhibitor, such as a farnesyl transferase inhibitor or a geranylgeranyl transferase inhibitor or a dual farnesyl/geranylgeranyl transferase inhibitor; and mixtures thereof.

(See B. Millauer et al., “Dominant-Negative Inhibition of Flk-1 Suppresses the Growth of Many Tumor Types in Vivo”, Cancer Research, 56, 1615-1620 (1996), which is incorporated by reference herein in its entirety).

Preferably, the active ingredient is selected from the group consisting of:

a.) an organic bisphosphonate or a pharmaceutically acceptable salt or ester thereof,

b.) an estrogen receptor modulator, and

c.) a cathepsin K inhibitor; and mixtures thereof.

Nonlimiting examples of such bisphosphonates include alendronate, etidronate, pamidronate, risedronate, ibandronate, and pharmaceutically acceptable salts and esters thereof. A particularly preferred bisphosphonate is alendronate, especially alendronate monosodium trihydrate.

Nonlimiting examples of estrogen receptor modulators include estrogen, progesterin, estradiol, droloxifene, raloxifene, and tamoxifene.

Nonlimiting examples of cytotoxic/antiproliferative agents are taxol, vincristine, vinblastine, and doxorubicin.

Cathepsin K, formerly known as cathepsin O2, is a cysteine protease and is described in PCT International Application Publication No. WO 96/13523, published May 9, 1996; U.S. Pat. No. 5,501,969, issued Mar. 3, 1996; and U.S. Pat. No. 5,736,357, issued Apr. 7, 1998, all of which are incorporated by reference herein in their entirety. Cysteine proteases, specifically cathepsins, are linked to a number of disease conditions, such as tumor metastasis, inflammation, arthritis, and bone remodeling. At acidic pH's, cathepsins can degrade type-I collagen. Cathepsin protease inhibitors can inhibit osteoclastic bone resorption by inhibiting the degradation of collagen fibers and are thus useful in the treatment of bone resorption diseases, such as osteoporosis.

The present invention is also directed to combinations of the compounds of the present invention with one or more agents useful in the prevention or treatment of osteoporosis. For example, the compounds of the instant invention may be effectively administered in combination with effective amounts of other agents such as an organic bisphosphonate, an estrogen receptor modulator, or a cathepsin K inhibitor.

Additional illustrations of the invention are methods of treating tumor growth or metastasis in a mammal in need thereof, comprising administering to the mammal a therapeutically effective amount of a compound described above and one or more agents known to be cytotoxic/antiproliferative. Also, the compounds of the present invention can be administered in combination with radiation therapy for treating tumor growth and metastasis.

In addition, the integrin αvβ3 antagonist compounds of the present invention may be effectively administered in combination with a growth hormone secretagogue in the therapeutic or prophylactic treatment of disorders in calcium or phosphate metabolism and associated diseases. These diseases include conditions which can benefit from a reduction in bone resorption. A reduction in bone resorption should improve the balance between resorption and formation, reduce bone loss or result in bone augmentation. A reduction in bone resorption can alleviate the pain associated with osteolytic lesions and reduce the incidence and/or growth of those lesions. These diseases include: osteoporosis (including estrogen deficiency, immobilization, glucocorticoid-induced and senile), osteodystrophy, Paget's disease, myositis ossificans, Bechterew's disease, malignant hypercalcemia, metastatic bone disease, periodontal disease, cholelithiasis, nephrolithiasis, urolithiasis, urinary calculus, hardening of the arteries (sclerosis), arthritis, bursitis, neuritis and tetany. Increased bone resorption can be accompanied by pathologically high calcium and phosphate concentrations in the plasma, which would be alleviated by this treatment. Similarly, the present invention would be useful in increasing bone mass in patients with growth hormone deficiency. Thus, preferred combinations are simultaneous or alternating treatments of an αvβ3 receptor antagonist of the present invention and a growth hormone secretagogue, optionally including a third component comprising an organic bisphosphonate, preferably alendronate monosodium trihydrate.

In accordance with the method of the present invention, the individual components of the combination can be administered separately at different times during the course of therapy or concurrently in divided or single combination forms. The instant invention is therefore to be understood as embracing all such regimes of simultaneous or alternating treatment, and the term “administering” is to be interpreted accordingly. It will be understood that the scope of combinations of the compounds of this invention with other agents useful for treating integrin-mediated conditions includes in principle any combination with any pharmaceutical composition useful for treating osteoporosis.

As used herein, the term “composition” is intended to encompass a product comprising the specified ingredients in the specified amounts, as well as any product which results, directly or indirectly, from combination of the specified ingredients in the specified amounts.

The compounds of the present invention can be administered in such oral dosage forms as tablets, capsules (each of which includes sustained release or timed release formulations), pills, powders, granules, elixirs, tinctures, suspensions, syrups and emulsions. Likewise, they may also be administered in intravenous (bolus or infusion), intraperitoneal, topical (e.g., ocular eyedrop), subcutaneous, intramuscular or transdermal (e.g., patch) form, all using forms well known to those of ordinary skill in the pharmaceutical arts. An effective but non-toxic amount of the compound desired can be employed as an αvβ3 antagonist.

The dosage regimen utilizing the compounds of the present invention is selected in accordance with a variety of factors including type, species, age, weight, sex and medical condition of the patient; the seventy of the condition to be treated; the route of administration; the renal and hepatic function of the patient; and the particular compound or salt thereof employed. An ordinarily skilled physician, veterinarian or clinician can readily determine and prescribe the effective amount of the drug required to prevent, counter or arrest the progress of the condition.

Oral dosages of the present invention, when used for the indicated effects, will range between about 0.01 mg per kg of body weight per day (mg/kg/day) to about 100 mg/kg/day, preferably 0.01 to 10 mg/kg/day, and most preferably 0.1 to 5.0 mg/kg/day. For oral administration, the compositions are preferably provided in the form of tablets containing 0.01, 0.05, 0.1, 0.5, 1.0, 2.5, 5.0, 10.0, 15.0, 25.0, 50.0, 100 and 500 milligrams of the active ingredient for the symptomatic adjustment of the dosage to the patient to be treated. A medicament typically contains from about 0.01 mg to about 500 mg of the active ingredient, preferably, from about 1 mg to about 100 mg of active ingredient. Intravenously, the most preferred doses will range from about 0.1 to about 10 mg/kg/minute during a constant rate infusion. Advantageously, compounds of the present invention may be administered in a single daily dose, or the total daily dosage may be administered in divided doses of two, three or four times daily. Furthermore, preferred compounds for the present invention can be administered in intranasal form via topical use of suitable intranasal vehicles, or via transdermal routes, using those forms of transdermal skin patches well known to those of ordinary skill in the art. To be administered in the form of a transdermal delivery system, the dosage administration will, of course, be continuous rather than intermittent throughout the dosage regimen.

In the methods of the present invention, the compounds herein described in detail can form the active ingredient, and are typically administered in admixture with suitable pharmaceutical diluents, excipients or carriers (collectively referred to herein as ‘carrier’ materials) suitably selected with respect to the intended form of administration, that is, oral tablets, capsules, elixirs, syrups and the like, and consistent with conventional pharmaceutical practices.

For instance, for oral administration in the form of a tablet or capsule, the active drug component can be combined with an oral, non-toxic, pharmaceutically acceptable, inert carrier such as lactose, starch, sucrose, glucose, methyl cellulose, magnesium stearate, dicalcium phosphate, calcium sulfate, mannitol, sorbitol and the like; for oral administration in liquid form, the oral drug components can be combined with any oral, non-toxic, pharmaceutically acceptable inert carrier such as ethanol, glycerol, water and the like. Moreover, when desired or necessary, suitable binders, lubricants, disintegrating agents and coloring agents can also be incorporated into the mixture. Suitable binders include starch, gelatin, natural sugars such as glucose or beta-lactose, corn sweeteners, natural and synthetic gums such as acacia, tragacanth or sodium alginate, carboxymethylcellulose, polyethylene glycol, waxes and the like. Lubricants used in these dosage forms include sodium oleate, sodium stearate, magnesium stearate, sodium benzoate, sodium acetate, sodium chloride and the like. Disintegrators include, without limitation, starch, methyl cellulose, agar, bentonite, xanthan gum and the like.

The compounds of the present invention can also be administered in the form of liposome delivery systems, such as small unilamellar vesicles, large unilamellar vesicles and multilamellar vesicles. Liposomes can be formed from a variety of phospholipids, such as cholesterol, stearylamine or phosphatidylcholines.

Compounds of the present invention may also be delivered by the use of monoclonal antibodies as individual carriers to which the compound molecules are coupled. The compounds of the present invention may also be coupled with soluble polymers as targetable drug carriers. Such polymers can include polyvinylpyrrolidone, pyran copolymer, polyhydroxypropylmethacrylamide-phenol, polyhydroxy-ethylaspartamide-phenol, or polyethyleneoxide-polylysine substituted with palmitoyl residues. Furthermore, the compounds of the present invention may be coupled to a class of biodegradable polymers useful in achieving controlled release of a drug, for example, polylactic acid, polyglycolic acid, copolymers of polylactic and polyglycolic acid, polyepsilon caprolactone, polyhydroxy butyric acid, polyorthoesters, polyacetals, polydihydropyrans, polycyanoacrylates and crosslinked or amphipathic block copolymers of hydrogels.

In the schemes and examples below, various reagent symbols and abbreviations have the following meanings:

BOP: Benzotriazol-1-yloxytris(dimethylamino)- phosphonium hexafluorophosphate. CH₂Cl₂: Methylene chloride. CHCl₃: Chlororoform. CH₃OH: Methanol DMF: N,N-Dimethylformamide. DMSO: Dimethylsulfoxide. EDC: 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide · HCl EtOAc: Ethyl acetate. EtOH: Ethanol. HOBT: 1-Hydroxybenzotriazole. HPLC: High Performance Liquid Chromatography. MgSO₄: Magnesium sulfate. NaCNBH₃: Sodium cyanoborohydride. NMM: N-methylmorpholine. NMR: Nuclear magnetic resonance. NH₄OH: Ammonium hydroxide. Pd/C: Palladium on activated carbon catalyst. Ph: Phenyl. TFA: Trifluoroacetic acid. TLC: Thin Layer Chromatography.

The novel compounds of the present invention can be prepared according to the procedure of the following Schemes and examples, using appropriate materials and are further exemplified by the following specific examples. The benzazepine intermediates used to prepare the compounds of the present invention are described in W. H. Miller, et al., Tetrahedron Lett. 1995, 36, 9433-9436; T. W. Ku, et al., Tetrahedron Lett. 1997, 38, 3131-3134; WO 96/00574; WO 96/00730; WO 96/26190; WO 97/24119; WO 97/24122; WO 97/24124; and WO 98/15278; the contents of each of which are incorporated by reference herein in their entirety. Peptide bond formation is carried using standard coupling reagents and conditions well-known to practitioners of the art of synthetic organic chemistry. Deprotection and hydrogenation conditions to generate the compounds of the present invention are also standard in the art.

The compounds illustrated in the examples are not to be construed as forming the only genus that is considered as the invention. The following examples further illustrate details for the preparation of the compounds of the present invention. Those skilled in the art will readily understand that known variations of the conditions and processes of the following preparative procedures can be used to prepare these compounds. All temperatures are degrees Celsius unless otherwise noted.

N-([1,8]Naphthyridin-2-ylmethyl)-methylamine (1-1)

The aldehyde 1-1 (280 mg, 1.8 mmol) (prepared according to Weissenfels, M., and Ulrici, B., Z. Chem. 1978, 18, 20) was stirred in methanol (50 mL) saturated with methylamine at 0° C. for 2 hours. The reaction mixture was then treated with sodium cyanoborohydride (122 mg, 1.9 mmol) and stirred overnight. Concentration and then flash chromatography (silica gel, EtOAc to 10% CH₃OH/EtOAc) gave 1-2.

¹H NMR (300 MHz, CDCl₃): δ9.11 (m, 1H), 8.20 (m, 2H), 7.55 (d, J=8 Hz, 1H), 7.53 (m, 1H), 4.15 (s, 2H), 2.60 (s, 3H).

{4-Methyl-7-[N-methyl-[1,8]naphthyridin-2-ylmethyl)-carbamoyl]-3-oxo-2,3,4,5-tetrahydro-1H-benzo[e][1,4]diazepin-2(S)-yl}-acetic acid methyl ester (1-4)

A solution of 1-2 (101 mg, 0.58 mmol), 1-3 (192 mg, 0.58 mmol) (prepared according to Miller, W. H., et al., Tetrahedron Lett., 1995, 36, 9433-9436), NMM (0.25 mL, 2.33 mmol), and BOP (387 mg, 0.88 mmol) in DMF (5 mL) was stirred at ambient temperature for 20 hours. The reaction mixture was concentrated and the residue dissolved in CHCl₃/isopropanol (4:1) and washed sequentially with water and saturated brine solution, dried (MgSO₄), and evaporated. Flash chromatography on silica gel (eluting with 20% CH₃OH/EtOAc) gave 1-4 as a tan foam.

¹H NMR (300 MHz, CD₃OD): δ9.06 (m, 1H), 8.49 (m, 1H), 8.44 (d, J=8 Hz, 1H), 7.65 (m, 2H), 7.27 (m, 2H), 6.60 (m, 1H), 5.55 (m, 1H), 5.22 (m, 1H), 5.00 (s, 2H), 3.90 (m, 1H), 3.69 (s, 3H), 3.30-2.60 (m, 6H).

{4-Methyl-7-[N-methyl-[1,8]naphthyridin-2-ylmethyl)-carbamoyl]-3-oxo-2,3,4,5-tetrahydro-1H-benzo[e][1,4]diazepin-2(S)-yl}-acetic acid (1-5)

To a solution of 1-4 (150 mg, 0.33 mmol) in methanol (1.7 mL) was added 1N NaOH (0.84 mL). The reaction mixture was stirred at ambient temperature for 6 hours. It was then neutralized with 1N HCl (0.84 mL) and then evaporated to dryness. Flash chromatography on silica gel (eluting with 85% [20:1:1 ethanol/NH₄OH/H₂O] in ethyl acetate) gave 1-5 as a yellow solid.

¹H NMR (300 MHz, D₂O): δ9.0 (m, 1H), 8.45 (m, 2H), 7.67 (m, 1H), 7.65-6.60 (m, 4H), 5.65-4.80 (m, 4H), 4.98 (m, 0.5H), 3.57 (m, 0.5H), 3.21 (s, 3H), 3.05 (s, 1.5H), 2.74 (s, 1.5H), 2.70-2.40 (m, 2H).

{4-Methyl-7-[N-methyl-(5,6,7,8-tetrahydro-[1,8]naphthynidin-2-ylmethyl)-carbamoyl]-3-oxo-2,3,4,5-tetrahydro-1H-benzo[e][1,4]diazepin-2(S)-yl }-acetic acid (1-6)

A mixture of 1-5 (100 mg, 0.23 mmol), 10% Pd/C (40 mg), and methanol (10 mL) was stirred at ambient temperature under a hydrogen atmosphere (1 atm) for 20 hours. The catalyst was removed by filtration through a pad of celite and the filtrate evaporated. Flash chromatography on silica gel (eluting with 75% [20:1:1 ethanol/NH₄OH/H₂O] in ethyl acetate) gave 1-6 as a fluffy solid.

¹H NMR (300 MHz, D₂O): δ7.35-6.40 (m, 5H), 5.60 (m, 0.33H), 5.50 (m, 0.67H), 5.20-5.05 (m, 1H), 4.52 (s, 0.67H), 4.40 (s, 1.33H), 3.96 (m, 0.33H), 3.72 (m, 0.67H), 3.31 (bs, 2H), 3.05-2.40 (m, 8H).

N-(4-Iodo-phenylsulfonylamino)-L-asparagine (A-2)

To a stirred solution of acid A-1 (4.39 g, 33.2 mmol), NaOH (1.49 g, 37.2 mmol), dioxane (30 ml) and H₂O (30 ml) at 0° C. was added pipsyl chloride (10.34 g, 34.2 mmol). After ˜5 minutes, NaOH (1.49, 37.2 mmol) dissolved in 15 ml H₂O, was added followed by the removal of the cooling bath. After 2.0 h, the reaction mixture was concentrated. The residue was dissolved in H₂O (300 ml) and then washed with EtOAc. The aqueous portion was cooled to 0° C. and then acidified with concentrated HCl. The solid was collected and then washed with diethyl ether to provide acid A-2 as a white solid.

¹H NMR (300 MHz, D₂O) δ7.86 (d, 2H, J=8 Hz), 7.48 (d, 2H, J=8 Hz) 3.70 (m, 1H), 2.39 (m, 2H).

2(S)-(4-Iodo-phenylsulfonylamino)-β-alanine (A-3)

To a stirred solution of NaOH (7.14 g, 181.8 mmol) and H₂O (40 ml) at 0° C. was added bromine (1.30 ml, 24.9 mmol) dropwise over a ten minute period. After ˜5 minutes, acid A-2 (9.9 g, 24.9 mmol), NaOH (2.00 g, 49.8 mmol) and H₂O (35 ml) were combined, cooled to 0° C. and then added in a single portion to the reaction. After stirring for 20 minutes at 0° C., the reaction was heated to 90° C. for 30 minutes and then recooled to 0° C. The pH was adjusted to ˜7 by dropwise addition of concentrated HCl. The solid was collected, washed with EtOAc, and then dried in vacuo to provide acid A-3 as a white solid.

¹H NMR (300 MHz, D₂O) δ8.02 (d, 2H, J=8 Hz), 7.63 (d, 2H, J=8 Hz), 4.36 (m, 1H), 3.51 (dd, 1H, J=5 Hz, 13 Hz) 3.21 (m, 1H).

Ethyl 2(S)-(4-iodo-phenylsulfonylamino)-β-alanine-hydrochloride (A-4)

HCl gas was rapidly bubbled through a suspension of acid A-3 (4.0 g, 10.81 mmol) in EtOH (50 ml) at 0° C. for 10 minutes. The cooling bath was removed and the reaction was heated to 60° C. After 18 h, the reaction was concentrated to provide ester A-4 as a white solid.

¹H NMR (300 MHz, CD₃OD) δ7.98 (d, 2H, J=8 Hz), 7.63 (d, 2H, J=8 Hz), 4.25 (q, 1H, J=5 Hz), 3.92 (m, 2H), 3.33 (m, 1H), 3.06 (m, 1H), 1.01 (t, 3H, J=7 Hz).

Ethyl 4-[2-(2-Aminopyridin-6-yl)ethyl]benzoate (A-5a)

A mixture of ester A-5 (700 mg, 2.63 mmol), (for preparation, see: Scheme 29 of PCT International Application Publication No. WO 95/32710, published Dec. 7, 1995) 10% Pd/C (350 mg) and EtOH were stirred under 1 atm hydrogen gas. After 20 h, the reaction was filtered through a celite pad and then concentrated to provide ester A-5a as a brown oil.

TLC R_(f)=0.23 (silica, 40% EtOAc/hexanes)

¹H NMR (300 MHz, CDCl₃) δ7.95 (d, 2H, J=8 Hz), 7.26 (m, 3H), 6.43 (d, 1H, J=7 Hz), 6.35 (d, 1H, J=8 Hz), 4.37 (m, 4H), 3.05 (m, 2H), 2.91 (m, 2H), 1.39 (t, 3H, J=7 Hz).

4-[2-(2-Aminopyridin-6-yl)ethyl]benzoic acid hydrochloride (A-6)

A suspension of ester A-5a (625 mg, 2.31 mmol) in 6N HCl (12 ml) was heated to 60° C. After ˜20 h, the reaction was concentrated to give acid A-6 as a tan solid.

¹H NMR (300 MHz, CD₃OD) δ7.96 (d, 2H, J=8 Hz), 7.80 (m, 1H), 7.33 (d, 2H, J=8 Hz), 6.84 (d, 1H, J=9 Hz), 6.69 (d, 1H, J=7 Hz), 3.09 (m, 4H).

Ethyl 4-[2-(2-Aminopyridin-6-yl)ethyl]benzoyl-2(S)-(4-iodo-phenylsulfonylamino)-β-alanine (A-7)

A solution of acid 15-6 (400 mg, 1.43 mmol), amine A-4 (686 mg, 1.57 mmol), EDC (358 mg, 1.86 mmol), HOBT (252 mg, 1.86 mmol), NMM (632 μl, 5.72 mmol) in DMF (10 ml) was stirred for ˜20 h. The reaction was diluted with EtOAc and then washed with saturated sodium hydrogencarbonate, brine, dried (MgSO₄) and concentrated. Flash chromatography (silica, EtOAc then 5% isopropanol/EtOAc) provided amide A-7 as a white solid.

TLC R_(f)=0.4 (silica, 10% isopropanol/EtOAc)

¹H NMR (300 MHz, CD₃OD) δ7.79 (d, 2H, J=9 Hz) 7.61 (d, 2H, J=8 Hz), 7.52 (d, 2H, J=9 Hz), 7.29 (m, 1H), 7.27 (d, 2H, J=8 Hz), 4.20 (m, 1H), 3.95 (q, 2H, J=7 Hz), 3.66 (dd, 1H, J=6 Hz, 14 Hz), 3.49 (dd, 1H, J=8 Hz, 13 Hz), 3.01 (m, 2H), 2.86 (m, 2H), 1.08 (t, 3H, J=7 Hz).

4-[2-(2-Aminopyridin-6-yl)ethyl]benzoyl-2(S)-(4-iodophenyl-sulfonylamino)-β-alanine (A-8)

A solution of ester A-7 (200 mg, 0.3213 mmol) and 6N HCl (30 ml) was heated to 60° C. After ˜20 h, the reaction mixture was concentrated. Flash chromatography (silica, 20:20:1:1 EtOAc/EtOH/ NH₄OH/H₂O) provided acid A-8 as a white solid.

TLC R_(f)=0.45 (silica, 20:20:1:1 EtOAc/EtOH/NH₄OH/H₂O)

¹H NMR (400 MHz, DMSO-d₆) δ8.40 (m, 1H), 8.14 (Bs, 1H), 7.81 (d, 2H, J=8 Hz), 7.62 (d, 2H, J=8 Hz), 7.48 (d, 2H, J=8 Hz), 7.27 (m, 3H), 6.34 (d, 1H, J=7 Hz), 6.25 (d, 1H, J=8 Hz), 5.85 (bs, 2H), 3.89 (bs, 1H), 3.35 (m, 2H), 2.97 (m, 2H), 2.79 (M, 2H).

4-[2-(2-Aminopyridin-6-yl)ethyl)benzoyl-2(S)-(4-trimethylstannyl-phenylsulfonylamino-β-alanine (A-9)

A solution of iodide A-8 (70 mg, 0.1178 mmol), [(CH₃₎₃Sn]₂ (49 μl, 0.2356 mmol), Pd(PPh₃)₄ (5 mg) and dioxane (7 ml) was heated to 90° C. After 2 h, the reaction was concentrated and then purified by preparative HPLC (Delta-Pak C₁₈ 15 μM 100 A°, 40×100 mm; 95:5 then 5:95 H₂O/CH₃CN) to provide the trifluoroacetate salt. The salt was suspended in H₂O (10 ml), treated with NH₄OH (5 drops) and then lyophilized to provide amide A-9 as a white solid.

¹H NMR (400 MHz, DMSO-d₆) δ8.40 (m, 1H), 8.18 (d, 1H, J=8 Hz), 7.67 (m, 5H), 7.56 (d, 2H, J=8 Hz), 7.29 (d, 2H, J=8 Hz), 6.95-7.52 (m, 2H), 6.45 (bs, 2H), 4.00 (m, 1H), 3.50 (m, 1H), 3.33 (m, 1H), 2.97 (m, 2H), 2.86 (m, 2H).

4-[2-(2-Aminopyridin-6-yl)ethyl]benzoyl-2(S)-4-¹²⁵iodo-phenylsulfonylamino-β-alanine (A-10)

An iodobead (Pierce) was added to a shipping vial of 5 mCi of Na¹²⁵I (Amersham, IMS30) and stirred for five minutes at room temperature. A solution of 0.1 mg of A-9 in 0.05 mL of 10% H₂SO₄/CH₃OH was made and immediately added to the Na¹²⁵I/iodobead vial. After stirring for three minutes at room temperature, approximately 0.04-0.05 mL of NH₄OH was added so the reaction mixture was at pH 6-7. The entire reaction mixture was injected onto the HPLC for purification [Vydac peptide-protein C-18 column, 4.6×250 mm, linear gradient of 10% acetonitrile (0.1% (TFA):H₂O) (0.1% TFA) to 90% acetonitrile (0.1% TFA):H₂O (0.1% TFA) over 30 minutes, 1 mL/min]. The retention time of A-10 is 17 minutes under these conditions. Fractions containing the majority of the radioactivity were pooled, lyophilized and diluted with ethanol to give approximately 1 mCi of A-10, which coeluted on HPLC analysis with an authentic sample of A-8.

Instrumentation: Analytical and preparative HPLC was carried out using a Waters 600E Powerline Multi Solvent Delivery System with 0.1 mL heads with a Rheodyne 7125 injector and a Waters 990 Photodiode Array Detector with a Gilson FC203 Microfraction collector. For analytical and preparative HPLC, a Vydac peptide-protein C-18 column, 4.6×250 mm was used with a C-18 Brownlee modular guard column. The acetonitrile used for the HPLC analyses was Fisher Optima grade. The HPLC radiodetector used was a Beckman 170 Radioisotope detector. A Vydac C-18 protein and peptide column, 3.9×250 mm was used for analytical and preparative HPLC. Solutions of radioactivity were concentrated using a Speedvac vacuum centrifuge. Calibration curves and chemical concentrations were determined using a Hewlett Packard Model 8452A UV/Vis Diode Array Spectrophotometer. Sample radioactivities were determined in a Packard A5530 gamma counter.

The test procedures employed to measure αvβ3 and αvβ5 binding and the bone resorption inhibiting activity of the compounds of the present invention are described below.

Bone Resorption-Pit Assay

When osteoclasts engage in bone resorption, they can cause the formation of pits in the surface of bone that they are acting upon. Therefore, when testing compounds for their ability to inhibit osteoclasts, it is useful to measure the ability of osteoclasts to excavate these resorption pits when the inhibiting compound is present.

Consecutive 200 micron thick cross sections from a 6 mm cylinder of bovine femur diaphysis are cut with a low speed diamond saw (Isomet, Beuler, Ltd., Lake Bluff, Ill.). Bone slices are pooled, placed in a 10% ethanol solution and refrigerated until further use.

Prior to experimentation, bovine bone slices are ultrasonicated twice, 20 minutes each in H₂O. Cleaned slices are placed in 96 well plates such that two control lanes and one lane for each drug dosage are available. Each lane represents either triplicate or quadruplicate cultures. The bone slices in 96 well plates are sterilized by UV irradiation. Prior to incubation with osteoclasts, the bone slices are hydrated by the addition of 0.1 ml αMEM, pH 6.9 containing 5% fetal bovine serum and 1% penicillin/streptomycin.

Long bones from 7-14 day old rabbits (New Zealand White Hare) are dissected, cleaned of soft tissue and placed in αMEM containing 20 mM HEPES. The bones are minced using scissors until the pieces are <1 mm and transferred to a 50 ml tube in a volume of 25 ml. The tube is rocked gently by hand for 60 cycles, the tissue is sedimented for 1 min., and the supernatant is removed. Another 25 ml of medium is added to the tissue and rocked again. The second supernatant is combined with the first. The number of cells is counted excluding erythrocytes (typically ˜2×10⁷ cells/ml). A cell suspension consisting of 5×10⁶/ml in αMEM containing 5% fetal bovine serum, 10 nM 1,25(OH)₂D₃, and pencillin-streptomycin is prepared. 200 ml aliquots are added to bovine bone slices (200 mm×6 mm) and incubated for 2 hrs. at 37° C. in a humidified 5% CO₂ atmosphere. The medium is removed gently with a micropipettor and fresh medium containing test compounds is added. The cultures are incubated for 48 hrs., and assayed for c-telopeptide (fragments of the al chain of type I collagen) by Crosslaps for culture media (Herlev, Denmark).

Bovine bone slices are exposed to osteoclasts for 20-24 hrs and are processed for staining. Tissue culture media is removed from each bone slice. Each well is washed with 200 ml of H20, and the bone slices are then fixed for 20 minutes in 2.5% glutaraldehyde, 0.1 M cacodylate, pH 7.4. After fixation, any remaining cellular debris is removed by 2 min. ultrasonication in the presence of 0.25 M NH₄OH followed by 2×15 min ultrasonication in H₂O. The bone slices are immediately stained for 6-8 min with filtered 1 % toluidine blue and 1% borax.

After the bone slices have dried, resorption pits are counted in test and control slices. Resorption pits are viewed in a Microphot Fx (Nikon) fluorescence microscope using a polarizing Nikon IGS filter cube. Test dosage results are compared with controls and resulting IC₅₀ values are determined for each compound tested.

The appropriateness of extrapolating data from this assay to mammalian (including human) disease states is supported by the teaching found in Sato, M., et al., Journal of Bone and Mineral Research, Vol. 5, No. 1, pp. 31-40, 1990, which is incorporated by reference herein in its entirety. This article teaches that certain bisphosphonates have been used clinically and appear to be effective in the treatment of Paget's disease, hypercalcemia of malignancy, osteolytic lesions produced by bone metastases, and bone loss due to immobilization or sex hormone deficiency. These same bisphosphonates are then tested in the resorption pit assay described above to confirm a correlation between their known utility and positive performance in the assay.

EIB Assay

Duong et al., J. Bone Miner. Res., 8: S378 (1993), describes a system for expressing the human integrin αvβ3. It has been suggested that the integrin stimulates attachment of osteoclasts to bone matrix, since antibodies against the integrin, or RGD-containing molecules, such as echistatin (European Publication 382 451), can effectively block bone resorption.

Reaction Mixture

1. 175 μl TBS buffer (50 mM Tris.HCl pH 7.2, 150 mM NaCl, 1% BSA, 1 mM CaCl₂, 1 mM MgCl₂).

2. 25 ml cell extract (dilute with 100 mM octylglucoside buffer to give 2000 cpm/25 μl).

3. ¹²⁵I-echistatin (25 μl/50,000 cpm) (see EP 382 451).

4. 25 μl buffer (total binding) or unlabeled echistatin (non-specific binding).

The reaction mixture was then incubated for 1 h at room temp. The unbound and the bound αvβ3 were separated by filtration using a Skatron Cell Harvester. The filters (prewet in 1.5% poly-ethyleneimine for 10 mins) were then washed with the wash buffer (50 mM Tris HCl, 1 mM CaCl₂/MgCl₂, pH 7.2). The filter was then counted in a gamma counter.

SPA Assay

Materials

1. Wheat germ agglutinin Scintillation Proximity Beads (SPA): Amersham

2. Octylglucopyranoside: Calbiochem

3. HEPES: Calbiochem

4. NaCl: Fisher

5. CaCl₂: Fisher

6. MgCl₂: SIGMA

7. Phenylmethylsulfonylfluoride (PMSF): SIGMA

8. Optiplate: PACKARD

9. Compound A-10 (specific activity 500-1000 Ci/mmole)

10. test compound

11. Purified integrin receptor: αvβ3 was purified from 293 cells overexpressing αvβ3 (Duong et al., J. Bone Min. Res., 8:S378, 1993) according to Pytela (Methods in Enzymology, 144:475, 1987)

12. Binding buffer: 50 mM HEPES, pH 7.8, 100 mM NaCl, 1 mM Ca^(2+/)Mg²⁺, 0.5 mM PMSF

13. 50 mM octylglucoside in binding buffer: 50-OG buffer

Procedure

1. Pretreatment of SPA beads:

500 mg of lyophilized SPA beads were first washed four times with 200 ml of 50-OG buffer and once with 100 ml of binding buffer, and then resuspended in 12.5 ml of binding buffer.

2. Preparation of SPA beads and receptor mixture

In each assay tube, 2.5 μl (40 mg/ml) of pretreated beads were suspended in 97.5 μl of binding buffer and 20 ml of 50-OG buffer. 5 ml (˜30 ng/μl) of purified receptor was added to the beads in suspension with stirring at room temperature for 30 minutes. The mixture was then centrifuged at 2,500 rpm in a Beckman GPR Benchtop centrifuge for 10 minutes at 4° C. The pellets were then resuspended in 50 μl of binding buffer and 25 μl of 50-OG buffer.

3. Reaction

The following were sequentially added into Optiplate in corresponding wells:

(i) Receptor/beads mixture (75 μl)

(ii) 25 μl of each of the following: compound to be tested, binding buffer for total binding or A-8 for non-specific binding (final concentration 1 μM)

(iii) A-10 in binding buffer (25 μl, final concentration 40 pM)

(iv) Binding buffer (125 μl)

(v) Each plate was sealed with plate sealer from PACKARD and incubated overnight with rocking at 4° C.

4. Plates were counted using PACKARD TOPCOUNT

5. % inhibition was calculated as follows:

A=total counts

B=nonspecific counts

C=sample counts

% inhibition=[{(A−B)−(C−B)}/(A−B)]/(A−B)×100

Ocform Assay

Osteoblast-like cells (1.8 cells), originally derived from mouse calvaria, were plated in CORNING 24 well tissue culture plates in αMEM medium containing ribo- and deoxyribonucleosides, 10% fetal bovine serum and penicillin-streptomycin. Cells were seeded at 40,000/well in the morning. In the afternoon, bone marrow cells were prepared from six week old male Balb/C mice as follows:

Mice were sacrificed, tibiae removed and placed in the above medium. The ends were cut off and the marrow was flushed out of the cavity into a tube with a 1 mL syringe with a 27.5 gauge needle. The marrow was suspended by pipetting up and down. The suspension was passed through >100 mm nylon cell strainer. The resulting suspension was centrifuged at 350×g for seven minutes. The pellet was resuspended, and a sample was diluted in 2% acetic acid to lyse the red cells. The remaining cells were counted in a hemacytometer. The cells were pelleted and resuspended at 1×10⁶ cells/mL. 50 μL was added to each well of 1.8 cells to yield 50,000 cells/well and 1,25-dihydroxy-vitamin D₃ (D₃) was added to each well to a final concentration of 10 nM. The cultures were incubated at 37° C. in a humidified, 5% CO₂ atmosphere. After 48 h, the medium was changed. 72 h after the addition of bone marrow, test compounds were added with fresh medium containing D₃ to quadruplicate wells. Compounds were added again after 48 h with fresh medium containing D₃. After an additional 48 h., the medium was removed, cells were fixed with 10% formaldehyde in phosphate buffered saline for 10 minutes at room temperature, followed by a 1-2 minute treatment with ethanol:acetone (1:1) and air dried. The cells were then stained for tartrate resistant acid phosphatase as follows:

The cells were stained for 10-15 minutes at room temperature with 50 mM acetate buffer, pH 5.0 containing 30 mM sodium tartrate, 0.3 mg/mL Fast Red Violet LB Salt and 0.1 mg/mL Naphthol AS -MX phosphate. After staining, the plates were washed extensively with deionized water and air dried. The number of multinucleated, positive staining cells was counted in each well.

αvβ5 Attachment Assay

Duong et al., J. Bone Miner. Res., 11: S290 (1996), describes a system for expressing the human αvβ5 integrin receptor.

Materials

1. Media and solutions used in this assay are purchased from BRL/Gibco, except BSA and the chemicals are from Sigma.

2. Attachment medium: HBSS with 1 mg/ml heat-inactivated fatty acid free BSA and 2 mM CaCl2.

3. Glucosaminidase substrate solution: 3.75 mM p-nitrophenyl N-acetyl-beta-D-glucosaminide, 0.1 M sodium citrate, 0.25% Triton, pH 5.0.

4. Glycine-EDTA developing solution: 50 mM glycine, 5 mM EDTA, pH 10.5.

Methods

1. Plates (96 well, Nunc Maxi Sorp) were coated overnight at 4° C. with human vitronectin (3 μg/ml) in 50 mM carbonate buffer (pH 9/.6), using 100 μl/well. Plates were then washed 2× with DPBS and blocked with 2% BSA in DPBS for 2 h at room temperature. After additional washes (2×) with DPBS, plates were used for cell attachment assay.

2. 293 (αvβ5) cells were grown in (αMEM media in presence of 10% fetal calf serum to 90% confluence. Cells were then lifted from dishes with 1× Trypsin/EDTA and washed 3× with serum free αMEM. Cells were resuspended in attachment medium (3×10⁵ cells/ml).

3. Test compounds were prepared as a series of dilutions at 2× concentrations and added as 50 μl/well. Cell suspension was then added as 50 ml/well. Plates were incubated at 37° C. with 55 CO₂ for 1 hour to allow attachment.

4. Non-adherent cells were removed by gently washing the plates (3×) with DPBS and then incubated with glucosaminidase substrate solution (100 μl/well), overnight at room temperature in the dark. To quantitate cell numbers, standard curve of glucosaminidase activity was determined for each experiment by adding samples of cell suspension directly to wells containing the enzyme substrate solution.

5. The next day, the reaction was developed by addition of 185 μl/well of glycine/EDTA solution and reading absorbance at 405 nm using a Molecular Devices V-Max plate reader. Average test absorbance values (4 wells per test samples) were calculated. Then, the number of attached cells at each drug concentration was quantitated versus the standard curve of cells using the Softmax program.

EXAMPLE OF A PHARMACEUTICAL FORMULATION

As a specific embodiment of an oral composition, 100 mg of any of the compounds of the present invention are formulated with sufficient finely divided lactose to provide a total amount of 580 to 590 mg to fill a size O hard gel capsule.

Representative compounds of the present invention were tested and found to bind to human αvβ3 integrin. These compounds were generally found to have IC₅₀ values less than about 100 nM in the SPA assay.

Representative compounds of the present invention were tested and generally found to inhibit ≧50% the attachment of αvβ5 expressing cells to plates coated with vitronectin at concentrations of about 1 μM.

While the invention has been described and illustrated in reference to certain preferred embodiments thereof, those skilled in the art will appreciate that various changes, modifications and substitutions can be made therein without departing from the spirit and scope of the invention. For example, effective dosages other than the preferred doses as set forth hereinabove may be applicable as a consequence of variations in the responsiveness of the mammal being treated for severity of bone disorders caused by resorption, or for other indications for the compounds of the invention indicated above. Likewise, the specific pharmacological responses observed may vary according to and depending upon the particular active compound selected or whether there are present pharmaceutical carriers, as well as the type of formulation and mode of administration employed, and such expected variations or differences in the results are contemplated in accordance with the objects and practices of the present invention. It is intended, therefore, that the invention be limited only by the scope of the claims which follow and that such claims be interpreted as broadly as is reasonable. 

What is claimed is:
 1. A compound of the formula

or a pharmaceutically acceptable salt thereof, wherein Y is selected from the group consisting of —(CH₂)_(m)—, —(CH₂)_(m)—O—(CH₂)_(n)—, —(CH₂)_(m)—NR⁴—(CH₂)_(n)—, —(CH₂)_(m)—S—(CH₂)_(n)—, —(CH₂)_(m)—SO—(CH₂)_(n)—, —(CH₂)_(m)—SO₂—(CH₂)_(n)—, —(CH₂)_(m)—O—(CH₂)_(n)—O—(CH₂)_(p)—, —(CH₂)_(m)—O—(CH₂)_(n)—NR⁴—(CH₂)_(p)—, —(CH₂)_(m)—NR⁴—(CH₂)_(n)—NR⁴—(CH₂)_(p)—, —(CH₂)_(m)—O—(CH₂)_(n)—S—(CH₂)_(p)—, —(CH₂)_(m)—S—(CH₂)_(n)—S—(CH₂)_(p)—, —(CH₂)_(m)—NR⁴—(CH₂)_(n)—S—(CH₂)_(p)—, —(CH₂)_(m)—NR⁴—(CH₂)_(n)—O—(CH₂)_(p)—, —(CH₂)_(m)—S—(CH₂)_(n)—O—(CH₂)_(p)—, and —(CH₂)_(m)—S—(CH₂)_(n)—NR⁴—(CH₂)_(p)—; wherein any methylene (CH₂) carbon atom in Y, other than in R⁴, can be substituted by one or two R³ substituents; Z is selected from the group consisting of

 wherein the ring carbon atoms are unsubstituted or substituted with one or two R⁶ substituents; R¹ and R² are each independently selected from the group consisting of hydrogen, halo, C₁₋₈ alkyl, C₂₋₈ alkenyl, C₂₋₈ alkynyl, C₃₋₈ cycloalkyl, C₃₋₈ cycloheteroalkyl, C₃₋₈ cycloalkyl C₁₋₆ alkyl, C₃₋₈ cycloheteroalkyl C₁₋₆ alkyl, aryl, aryl C₁₋₆ alkyl, amino C₁₋₆ alkyl, C₁₋₄ acylamino C₁₋₆ alkyl, (C₁₋₆ alkyl)_(p)amino C₁₋₆ alkyl, hydroxy C₁₋₆ alkyl, C₁₋₆ alkoxy C₁₋₆ alkyl, C₁₋₆ alkylthio C₁₋₆ alkyl, hydroxycarbonyl C₁₋₆ alkyl, C₁₋₄ alkoxycarbonyl C₁₋₆ alkyl, and trifluoromethyl; each R³ is independently selected from the group consisting of hydrogen, halo, aryl, C₁₋₈ alkyl, C₂₋₈ alkenyl, C₂₋₈ alkynyl, aryl C₁₋₆ alkyl, C₃₋₈ cycloalkyl, hydroxyl, oxo, trifluoromethyl, C₁₋₆ alkoxy, aryl C₁₋₆ alkoxy, C₁₋₆ alkylthio, aryl C₁₋₆ alkylthio, aminocarbonyl, (C₁₋₆ alkyl)_(p)aminocarbonyl, arylaminocarbonyl, aryl C₁₋₆ alkylaminocarbonyl, aryloxycarbonylamino, C₁₋₆ alkoxycarbonylamino, aryl C₁₋₆ alkoxycarbonylamino, arylcarbonylamino C₁₋₆ alkylcarbonylamino, aryl C₁₋₆ alkylcarbonylamino, (C₁₋₆ alkyl)_(p)aminocarbonyloxy, C₁₋₆ alkylsulfonylamino, arylsulfonylamino, aryl C₁₋₆ alkylsulfonylamino, C₁₋₆ alkylsulfonyl, aryl C₁₋₆ alkylsulfonyl, C₁₋₆ alkylcarbonyl, and aryl C₁₋₆ alkylcarbonyl, or two R³ substituents, when on the same carbon atom are taken together with the carbon atom to which they are attached to form a carbonyl group or a cyclopropyl group, wherein any of the alkyl groups of R³ are either unsubstituted or substituted with one to three R¹ substituents, and provided that each R³ is selected such that in the resultant compound the carbon atom or atoms to which R³ is attached is itself attached to no more than one heteroatom; each R⁴ is independently selected from the group consisting of hydrogen, C₁₋₈ alkyl, C₂₋₈ alkenyl, C₂₋₈ alkynyl, aryl C₁₋₆ alkyl, C₁₋₄ alkoxy C₁₋₆ alkyl, C₃₋₈ cycloalkyl, C₁₋₆ alkylsulfonyl, arylsulfonyl, arylC₁₋₆ alkylsulfonyl, C₁₋₆ alkoxycarbonyl, aryloxycarbonyl, aryl C₁₋₆ alkoxycarbonyl, C₁₋₆ alkylcarbonyl, arylcarbonyl, aryl C₁₋₆ alkylcarbonyl, hydroxycarbonyl C₁₋₆ alkyl, C₁₋₄ alkoxycarbonyl C₁₋₆ alkyl, (aryl)_(p)aminocarbonyl, (aryl) C₁₋₆ alkyl)_(p)aminocarbonyl, and (C₁₋₆ alkyl)_(p)aminocarbonyl; wherein any of the alkyl groups of R⁴ are either unsubstituted or substituted with one to three R¹ substituents; R⁵ is selected from the group consisting of hydrogen, C₁₋₈ alkyl, aryl, aryl C₁₋₆ alkyl, C₁₋₆ alkylcarbonyloxy C₁₋₄ alkyl, aryl C₁₋₆ alkylcarbonyloxy C₁₋₄ alkyl, C₁₋₆ alkylaminocarbonylmethylene, and C₁₋₆ dialkylaminocarbonylmethylene; each R⁶ is selected from the group consisting of hydrogen, cyano, nitro, halo, C₁₋₈ alkyl, C₂₋₈ alkenyl, C₂₋₈ alkynyl, C₃₋₈ cycloalkyl, C₃₋₈ cycloheteroalkyl, C₃₋₈ cycloalkyl C₁₋₆ alkyl, C₃₋₈ cycloheteroalkyl C₁₋₆ alkyl, aryl, aryl C₁₋₆ alkyl, amino, C₁₋₄ acylamino, (C₁₋₆ alkyl)_(p)amino, C₁₋₆ alkoxy, C₁₋₆ alkylthio, hydroxycarbonyl, aminocarbonyl, (C₁₋₆ alkyl)_(p)aminocarbonyl, C₁₋₄ alkoxycarbonyl, hydroxy, trifluoromethyl, and trifluoromethoxy; R⁷ is selected from the group consisting of hydrogen, C₁₋₈ alkyl, C₂₋₈ alkenyl, C₂₋₈ alkynyl, C₃₋₈ cycloalkyl, C₃₋₈ cycloheteroalkyl, C₃₋₈ cycloalkyl C₁₋₆ alkyl, C₃₋₈ cycloheteroalkyl C₁₋₆ alkyl, and aryl C₁₋₆ alkyl; R⁸ is selected from the group consisting of hydrogen, aryl, C₁₋₈ alkyl, C₂₋₈ alkenyl, C₂₋₈ alkynyl, C₃₋₈ cycloalkyl, C₃₋₈ cycloheteroalkyl, C₃₋₈ cycloalkyl C₁₋₆ alkyl, C₃₋₈ cycloheteroalkyl C₁₋₆ alkyl aryl C₁₋₆ alkyl, trifluoromethyl, 2,2,2-trifluoroethyl, hydroxycarbonyl C₁₋₆ alkyl, C₁₋₄ alkoxycarbonyl C₁₋₆ alkyl, and C₁₋₄ alkoxy C₁₋₆ alkyl; each m is independently an integer from 0 to 6; each n is independently an integer from 0 to 6; and each p is independently an integer from 0 to
 2. 2. The compound of claim 1 wherein Y is selected from the group consisting of —(CH₂)_(m)—, —(CH₂)_(m)—O—(CH₂)_(n)—, —(CH₂)_(m)—NR⁴—(CH₂)_(n)—, —(CH₂)_(m)—S—(CH₂)_(n)—, —(CH₂)_(m)—SO—(CH₂)_(n)—, —(CH₂)_(m)—SO₂—(CH₂)_(n)—, —(CH₂)_(m)—O—(CH₂)_(n)—O—(CH₂)_(p)—, —(CH₂)_(m)—O—(CH₂)_(n)—NR⁴—(CH₂)_(p)—, —(CH₂)_(m)—NR⁴—(CH₂)_(n)—NR⁴—(CH₂)_(p)—, and —(CH₂)_(m)—NR⁴—(CH₂)_(n)—O—(CH₂)_(p)—, wherein any methylene (CH₂) carbon atom in Y, other than in R⁴, can be substituted by one or two R³ substituents; Z is

wherein the ring carbon atoms are unsubstituted or substituted with one or two R⁶ substituents; R¹ and R² are independently selected from the group consisting of hydrogen, C₁₋₆ alkyl, C₃₋₈ cycloalkyl, C₃₋₈ cycloheteroalkyl, and aryl C₁₋₃ alkyl; each R3 is independently selected from the group consisting of hydrogen, aryl, C₁₋₈ alkyl, aryl C₁₋₆ alkyl, fluoro, hydroxy, oxo, trifluoromethyl, aminocarbonyl, arylaminocarbonyl, aryl C₁₋₆ alkylaminocarbonyl, and (C₁₋₆ alkyl)_(p)aminocarbonyl; each R⁴ is independently selected from the group consisting of hydrogen, C₁₋₈ alkyl, aryl C₁₋₆ alkyl, C₃₋₈ cycloalkyl, C₁₋₄ alkoxy C₁₋₆ alkyl, C₁₋₆ alkylsulfonyl, arylC₁₋₆ alkylsulfonyl, C₁₋₆ alkoxycarbonyl, aryl C₁₋₆ alkoxycarbonyl, C₁₋₆ alkylcarbonyl, arylcarbonyl, aryl C₁₋₆ alkylcarbonyl, (aryl)_(p)aminocarbonyl, (aryl C₁₋₆ alkyl)_(p)aminocarbonyl, and (C₁₋₆ alkyl)_(p)aminocarbonyl; each R6 is independently selected from the group consisting of hydrogen, cyano, halo, C₁₋₄ alkyl, aryl, aryl C₁₋₃ alkyl, C₁₋₄ acylamino, C₁₋₄ alkoxy, C₁₋₄ alkylthio, aminocarbonyl, (C₁₋₆ alkyl)_(p)aminocarbonyl, C₁₋₄ alkoxycarbonyl, trifluoromethyl, and trifluoromethoxy; R7 is hydrogen, C₁₋₃ alkyl, or aryl C₁₋₃ alkyl; and R⁸ is selected from the group consisting of hydrogen, C₁₋₄ alkyl, aryl C₁₋₄ alkyl, trifluoromethyl, 2,2,2-trifluoroethyl, and C₁₋₄ alkoxy C₁₋₄ alkyl.
 3. The compound of claim 2 wherein Y is selected from the group consisting of —(CH₂)_(m)—, —(CH₂)_(m)—O—(CH₂)_(n)—, —(CH₂)_(m)—NR⁴—(CH₂)_(n)—, and —(CH₂)_(m)—S—(CH₂)_(n)—; wherein any methylene (CH₂) carbon atom in Y, other than in R⁴, can be substituted by one or two R³ substituents; Z is

wherein the ring carbon atoms are unsubstituted or substituted with one or two R⁶ substituents; and R⁴ is selected from the group consisting of hydrogen, C₁₋₃ alkyl, aryl C₁₋₄ alkyl, 2,2,2-trifluoroethyl, and C₁₋₃ alkoxy C₁₋₃ alkyl; and m and n are each independently integers from 1 to
 3. 4. The compound of claim 3 wherein Y is —(CH₂)_(m)—NR⁴—(CH₂)_(n)—, wherein any methylene (CH₂) carbon atom in Y, other than in R⁴, can be substituted by one or two R³ substituents; R¹ and R² are each independently hydrogen or C₁₋₃ alkyl; R³ is hydrogen or oxo; R⁴ and R⁸ are each independently hydrogen or methyl, and m and n are each independently integers from 1 to
 2. 5. The compound of claim 4 wherein R¹ and R² are each hydrogen; R⁴ and R⁸ are each methyl; R³ is oxo; and m and n are both
 1. 6. The compound of claim 5 wherein R⁵ is selected from the group consisting of hydrogen, methyl, and ethyl.
 7. The compound of claim 6 wherein R⁵ is hydrogen.
 8. The compound {4-Methyl-7-[methyl-(5,6,7,8-tetrahydro-[1,8]naphthyridin-2-ylmethyl)-carbamoyl]-3-oxo-2,3,4,5-tetrahydro-1H-benzo[e][1,4]diazepin-2(S)-yl}-acetic acid, or a pharmaceutically acceptable salt thereof.
 9. A pharmaceutical composition comprising a compound according to claim 1 and a pharmaceutically acceptable carrier.
 10. A process for making a pharmaceutical composition comprising combining a compound according to claim 1 and a pharmaceutically acceptable carrier.
 11. A method of inhibiting a condition selected from the group consisting of bone resorption, restenosis, angiogenesis, diabetic retinopathy, macular degeneration, inflammatory arthritis, and comprising administering to a mammal in need thereof a therapeutically effective amount of a compound according to claim
 1. 12. The method of claim 11 wherein the condition to be inhibited is bone resorption.
 13. A method of inhibiting bone resorption in a mammal in need thereof, comprising administering to the mammal a therapeutically effective amount of the composition of claim
 9. 14. A method of treating in a mammal in need thereof, comprising administering to the mammal a therapeutically effective amount of a compound according to claim 1 in combination with radiation therapy.
 15. A method of treating or preventing osteoporosis which comprises administering to a mammal in need of such treatment or prevention a therapeutically or prophylactically effective amount of a compound of claim
 1. 